In the original article, there was a mistake in Supplementary Table 1 and Supplementary Table 2 as published. The study by Vaihinger et al. was incorrectly given “8” points on the Newcastle Ottawa Scale instead of “9”. The corrected Supplementary Table 1 and Supplementary Table 2 appears below.
Table 1.
Synoptic table of characteristics of all included studies.
| First author, year | Location (s) | Cohort/ case-controla | Perspectivea | Prosp/Retro | Total infants (centers) | Mean BW (g) | Mean GA (wks) | Male (%) | ACS (%) | CA categoryb | Incidence of CA (%) | Definition of CAc | Incidence of all IVH (%) | Incidence of severe IVH (%) | Definition of IVHd | NO-S Quality score |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aden, 2013 | Sweden, Finland, USA | Ca-co | IVH | Prosp | 612 (27) | 844 | 26,2 | 59 | 100 | CCA | 23 | NoDes | 37 | NA | 6 | |
| Ahn, 2012 | Seoul, Korea | Cohort | CA | Prosp | 257 (1) | 1536 | 30,6 | 60 | HCA | 35 | Ref | 2 | Ref | 8 | ||
| Alexander, 1998 | Dallas, USA | Cohort | CA | Prosp | 1367 (1) | 1138 | 28,9 | CCA | 7 | Des | 12 | Ref | 7 | |||
| Arayici, 2004 | Ankara, Turkey | Cohort | CA | Retro | 281 (1) | 1173 | 28,9 | 55 | 71 | HCA | 52 | Des | 10 | Ref | 7 | |
| Austeng, 2010 | Sweden | Cohort | CA | Prosp | 468 (7) | 767 | 24,9 | 55 | 71 | CCA | 17 | NoDes | 14 | Ref | 8 | |
| Babnik, 2006 | Ljubljana, Slovenia | Cohort | CA-IVH | Prosp | 125 (1) | 1019 | 27 | 54 | 53 | HCA & F | 39 | Des | 41 | Ref | 7 | |
| Barrera-Reyes, 2011 | Mexico, Mexico | Cohort | CA | Prosp | 104 (1) | 1071 | 30,0 | 52 | CCA | 22 | Ref | 29 | NA | 6 | ||
| Baumert, 2008 | Katowice, Poland | Ca-co | IVH | Prosp | 2675 (1) | 3351 | 38,3 | 51 | CCA | 4 | NoDes | 15 | Ref | 7 | ||
| Been, 2009 | Rotterdam, Nehterlands | Cohort | CA | Prosp | 301 (1) | 1143 | 29,1 | 51 | 70 | HCA | 40 | Des | 15 | 4 | NA | 7 |
| Bermick, 2016 | Michigan, USA | Cohort | IVH | Retro | 216 | 764 | 25,5 | 51 | 81 | HCA | 41 | NoDes | 56 | NA | Ref | 8 |
| Bordigato, 2010 | Padova, Italy | Cohort | CA | Prosp | 29 (1) | 805 | 26,7 | 59 | 76 | HCA | 48 | Ref | 27 | 3 | NA | 7 |
| Botet, 2010 | Spain | Ca-co | CA | Prosp | 328 (12) | 1057 | 28,2 | 54 | HCA | 50 | Ref | 27 | 12 | NA | 8 | |
| Bry, 2015 | Gothenburg, Sweden | Cohort | CA | Prosp | 24 (1) | 777 | 25,9 | 50 | 100 | HCA | 67 | Ref | 17 | NA | 6 | |
| Dalton, 2015 | Michigan, USA | Cohort | IVH | Retro | 216 (1) | 764 | 25,5 | 51 | 81 | HCA | 41 | NoDes | 56 | Ref | 6 | |
| Dempsey, 2005 | Montreal, Canada | Cohort | CA | Retro | 330 (1) | 987 | 27,0 | 63 | HCA | 39 | Des | 10 | Ref | 7 | ||
| Dexter, 2000 | Rhode Island, USA | Cohort | CA | Prosp | 275 (1) | 904 | 26,5 | 53 | 22.3 | HCA | 57 | Des | 32 | 10 | NA | 6 |
| Ecevit, 2014 | Ankara, Turkey | Cohort | CA | Retro | 36 (1) | 1524 | 29,7 | 59 | HCA | 58 | Des | 19 | NA | 6 | ||
| Elimian, 2000 | New York, USA | Cohort | CA | Prosp | 1260 (1) | 1183 | 29.0 | 42 | HCA | 42 | Ref | 27 | 12 | Ref | 9 | |
| Erdemir, 2013 | Izkir, Turkey | Cohort | CA | Prosp | 57 (1) | 1675 | 30,8 | 46 | 65 | HCA and/or CCA | 21 | Des | 12 | NA | 6 | |
| Fung, 2003 | Clayton, Australia | Cohort | CA | Prosp | 62 (1) | 794 | 26,2 | 50 | 83 | HCA and/or CCA | 25 | Des | 24 | NA | 6 | |
| Gagliardi, 2014 | Italian Neonatal Network | Cohort | CA | Retro | 3606 (82) | 938 | 27,4 | 50 | 84 | CCA | 42 | NoDes | 11 | Ref | 9 | |
| Garcia-Munoz Rodrigo, 2014 | Spanish Network | Cohort | CA | Prosp | 8330 (53) | 1086 | 28,5 | 52 | 87 | CCA | 18 | Des | 10 | NA | 9 | |
| Gawade, 2013 | Springfield, USA | Cohort | IVH | Retro | 78 (1) | 980 | 26,8 | 59 | 85 | CCA | 15 | Nodes | 44 | 12 | Ref | 6 |
| Gonzalez-Luis, 2002 | Barcelona, Spain | Ca-co | CA | Retro | 135 (1) | 1147 | 28,9 | CCA | 33 | Des | 20 | 7 | NA | 7 | ||
| Gray, 1997 | Brisbane, Australia | Cohort | IVH | Retro | 158 (1) | 955 | 27,0 | 57 | HCA and/or CCA | 10 | Des | 25 | 8 | NA | 7 | |
| Hendson, 2011 | Edmonton, Canada | Cohort | CA | Prosp | 617 (1) | 930 | 26,9 | 48 | 83 | HCA | 48 | Des | 16 | Ref | 7 | |
| Hitti, 2001 | Seattle, USA | Cohort | CA | Prosp | 140 (2) | 1699 | 29,3 | 51 | Microbiol | 17 | Des | 14 | 6 | Ref | 7 | |
| Holcroft, 2003 | Baltimore, USA | Ca-Co | CA | Retro | 213 (1) | 1045 | 28,3 | CCA | 21 | Des | 36 | NA | 5 | |||
| Kallankari, 2010 | Oulu, Finland | Cohort | IVH | Prosp | 163 (1) | 92,2 | 86 | HCA | 39 | Ref | 14 | Ref | 7 | |||
| Kaulkola,2006 | Oulu, Finland | Cohort | IVH | Prosp | 51 (1) | 772 | 27 | 41 | 90 | HCAA | 49 | Ref | 22 | Ref | 7 | |
| Kidokoro | New Zealand, Australia, USA | Cohort | IVH | Prosp | 325 (3) | 959 | 27,5 | 47 | 86 | CCA | 22 | Des | 19 | 4 | Ref | 8 |
| Kim, 2015 | Seoul, Korea | Cohort | CA | Retro | 235 (1) | 1104 | 29,2 | 50 | 81 | HCA & F | 38 | Ref | 6 | NA | 7 | |
| Kirchner, 2007 | Vienna, Austria | Cohort | CA | Retro | 44 (1) | 27,9 | 53 | 93 | Microbiol | 34 | NoDes | 9 | Ref | 7 | ||
| Klebermans-Schrehof | Vienna, Austria | Cohort | IVH | Retro | 471 (1) | 996 | 27,4 | 53 | 93 | HCA and/or CCA | 38 | NoDes | 32 | Ref | 7 | |
| Kosuge, 2000 | Minamikawac hi-machi, Japan | Cohort | CA | Retro | 81 (1) | 1181 | 28,1 | 68 | 17 | HCA | 54 | Ref | 11 | NA | 6 | |
| Lau, 2005 | Vancouver, Canada | Cohort | CA | Prosp | 1296 (1) | 2068 | 33,2 | 55 | 47 | HCA & F | 31 | Ref | 5 | Ref | 7 | |
| Lee Hyun Ju, 2011 | Seoul, Korea | Cohort | CA | Retro | 147 (2) | 791 | 27 | 55 | 67 | HCA | 48 | Ref | 40 | Ref | 7 | |
| Lee Ju Young, 2010 | Seoul, Korea | Ca-Co | IVH | Retro | 177 (2) | 954 | 27,5 | 53 | HCA | 45 | NoDes | 22 | Ref | 8 | ||
| Lim, 2011 | Taiwan | Ca-Co | IVH | Retro | 72 (1) | 768 | 24,7 | 64 | CCA | 13 | Des | 50 | Ref | 9 | ||
| Linder, 2003 | Israel | Ca-Co | IVH | Retro | 105 (1) | 826 | 25,4 | 58 | 73 | CCA | 24 | Des | 34 | Ref | 9 | |
| Liu, 2014 | Changhai, China | Cohort | CA | Prosp | 95 (1) | 1706 | 31,7 | 58 | 89 | HCA | 52 | Ref | 43 | 8 | Ref | 7 |
| Logan, 2013 | USA | Cohort | IVH | Retro | 921 (14) | 51 | 90 | HCA | 36 | Des | 6 | NA | 7 | |||
| Lu, 2016 | Jiangsu, China | Ca-Co | IVH | Retro | 137 (1) | 1205 | 31,9 | 58 | 50 | HCA & CCA | 44 | Des | 24 | Ref | 7 | |
| Mehta, 2006 | New Brunswick, USA | Cohort | CA-IVH | Retro | 164 (1) | HCA | 39 | Ref | 37 | NA | 7 | |||||
| Mestan, 2010 | Boston, USA | Cohort | CA | Prosp | 256 (1) | 1437 | 30,3 | 48 | 77 | HCA | 37 | Ref | 4 | Ref | 7 | |
| Miyazaki, 2016 | Network database, Japan | Cohort | CA | Retro | 4078 (54) | 973 | 27,6 | 49 | 41 | HCA | 30 | Ref | 15 | Ref | 9 | |
| Morales, 1987 | Orlando, USA | Ca-Co | Ca | Prosp | 86 (1) | 1178 | 29,2 | HCA & CCA | 50 | Des | 86 | 28 | Ref | 7 | ||
| Mu, 2008 | Taipei, Taiwan | Cohort | CA | Prosp | 119 (1) | 1108 | 28,6 | 54 | 45 | HCA | 54 | Ref | 22 | 17 | Ref | 8 |
| Nasef, 2013 | Toronto, Canada | Cohort | CA | Retro | 274 (1) | 952 | 27 | 55 | 85 | HCA & CCA | 47 | Ref | 23 | 1 | Ref | 7 |
| Ogunyemi, 2003 | New jersey, USA | Cohort | CA | Retro | 774 (1) | 1313 | 29,4 | 53 | HCA | 33 | Ref | 39 | 5 | NA | 7 | |
| Oh, 2015 | Seoul, Korea | Cohort | CA | Retro | 175 (1) | 765 | 27,1 | 55 | 60 | HCA | 25 | Ref | NA | Ref | 9 | |
| Oh, 2018 | Seoul, Korea | Cohort | IVH | Retro | 207 | 1269 | 29.7 | 48 | 75 | HCA | 44 | Ref | 7* | NA | Ref | 9 |
| Ohyama, 2002 | Yokohama, Japan | Cohort | CA | Retro | 143 (1) | 1162 | 27,8 | HCA & F | 63 | Ref | 9 | NA | 6 | |||
| Osmanagaoglu, 2005 | Trabzon, Turkey | Cohort | CA | Retro | 254 (1) | 1828 | 32 | 56 | 65 | CCA | 12 | Ref | 6 | NA | 7 | |
| Pappas, 2014 | USA | Cohort | CA | Prosp | 1918 (16) | 24,4 | 51 | 75 | HCA | 55 | Ref | 29 | NA | 6 | ||
| Perrone, 2012 | Siena, Italy | Cohort | CA | Prosp | 92 (1) | 998 | 26,3 | HCA | 49 | Ref | 48 | Ref | 7 | |||
| Polam, 2005 | New Brunswick, USA | Cohort | CA | Prosp | 177 (1) | 955 | 26,5 | 53 | 74 | HCA | 58 | Des | 26 | 7 | NA | 6 |
| Poralla, 2012 | Bonn, Germany | Cohort | IVH | Retro | 132 (1) | 714 | 25,5 | 50 | 87 | CCA | 39 | Des | 44 | NA | 6 | |
| Richardson, 2006 | London Ontario, Canada | Cohort | CA | Retro | 660 (1) | 1602 | 30,1 | 55 | HCA | 44 | Des | 22 | NA | 6 | ||
| Rocha, 2006 & Rocha, 2007 | Porto, Portugal | Cohort | CA | Retro | 452 (3) | 1504 | 29,5 | 52 | 65 | HCA | 28 | Ref | 18 | 9 | Ref | 9 |
| Rodríguez-Trujillo, 2016 | Barcelona, Spain | Cohort | CA | Prosp | 165 (1) | 1721 | 30,2 | HCA | 67 | NoDes | 10 | NA | 7 | |||
| Rong, 2012 | Wuhan, China | Ca-co | IVH | Retro | 232 (3) | 1566 | 30,7 | 73 | 41 | CCA | 19 | NoDes | 34 | NA | 8 | |
| Ryckman, 2011 | Iowa, USA | Cohort | IVH | Prosp | 219 | 58 | CCA | 15 | NoDes | 22 | Ref | 6 | ||||
| Salas, 2013 | Alabama, USA | Cohort | CA | Retro | 347 (1) | 829 | 26,1 | 50 | 62 | HCA | 43 | Ref | 17 | Ref | 7 | |
| Sarkar, 2005 | New York, USA | Cohort | CA-IVH | Prosp | 62 (1) | 884 | 62,2 | 45 | 90 | HCA | 47 | Ref | 15 | 7 | Ref | 7 |
| Sato, 2011 | Yokohama, Japan | Cohort | CA | Retro | 302 (1) | 938,4 | 26,3 | 52 | 62 | HCA | 52 | Ref | 27 | NA | 7 | |
| Seliga-Siwecka, 2013 | Warsaw, Poland | Cohort | CA | Prosp | 383 (1) | 1338 | 29,2 | 56 | 84 | HCA | 37 | Ref | 45 | Ref | 9 | |
| Shankaran, 2014 | USA and Sweden | Ca-co | IVH | Prosp | 1111 (24) | 817 | 26,0 | 56 | 53 | CCA | 29 | NoDes | 52 | Ref | 8 | |
| Smit, 2015 | Veldhoven, Netherlands | Cohort | CA | Retro | 300 (1) | 1303 | 29,4 | 54 | 92 | HCA & F | 45 | Ref | 4 | NA | 7 | |
| Soraisham, 2009 | Canadian Neonatal Network | Cohort | CA | Prosp | 3094 (24) | 1320 | 28,9 | 53 | 79 | CCA | 15 | Des | 14 | Ref | 9 | |
| Soraisham, 2013 | Regional NICU Southern Alberta, Canada | Cohort | CA | Retro | 384 (1) | 885 | 26,3 | 51 | 86 | HCA | 51 | Des | 21 | 7 | Ref | 6 |
| Suarez, 2001 | Chicago, USA | Ca-co | IVH | Retro | 280 (1) | 1328 | 29,6 | 56 | CCA | 19 | Des | 20 | Ref | 7 | ||
| Suppiej, 2009 | Padova, Italy | Cohort | CA | Prosp | 104 (1) | 1078 | 28,5 | 46 | 87 | HCA | 39 | Ref | 13 | Ref | 6 | |
| Trevisanuto, 2010 | Padua, Italy | Ca-co | CA | Prosp | 142 (1) | 1075 | 27,8 | 55 | 89 | HCA | 50 | Ref | 4 | Ref | 8 | |
| Tsiartas, 2013 | Králove, Czech Republic | Cohort | CA | Retro | 231 (1) | 1975 | 33,0 | 56 | HCA & F | 61 | Ref | 20 | 1 | Ref | 7 | |
| Vaihinger, 2013 | Buenos Aires, Argentina | Ca-co | IVH | Retro | 198 (1) | 1072 | 28,0 | 53 | 66 | CCA | 24 | NoDes | 25 | Ref | 9 | |
| van Vliet, 2012 | Amsterdam, Netherlands | Cohort | CA | Prosp | 72 (1) | 1110 | 29,0 | 51 | 82 | HCA | 29 | Ref | 29 | NA | 6 | |
| Vergani, 2004 | Monza, Italy | Cohort | IVH | Retro | 653 (1) | 1335 | 30,1 | 50 | 50 | CCA | 11 | Des | 7 | Ref | 7 | |
| Watterberg, 1999 | Pennsylvania, USA | Cohort | CA | Prosp | 40 (2) | 751 | 25,3 | 38 | 85 | HCA | 55 | NoDes | 38 | 8 | Na | 7 |
| Wirbelauer, 2011 | Wuerzburg, Germany | Cohort | CA | Prosp | 71 (1) | 871 | 27,9 | 52 | 94 | HCA & F | 24 | Ref | 9 | Ref | 7 | |
| Xu, 2012 | Hangzhou, China | Cohort | IVH | Prosp | 88 (1) | 1540 | 31,8 | 53 | HCA and/or CCA | 47 | NoDes | 25 | 8 | Ref | 7 | |
| Yamada, 2015 | Miyazaki, Japan | Cohort | CA | Prosp | 212 (1) | 25 | HCA | 65 | Ref | 20 | NA | 7 | ||||
| Yanowitz, 2006 | Pittsburgh, USA | Cohort | CA | Prosp | 49 (1) | 1273 | 28,7 | 61 | HCA | 49 | Ref | 57 | 2 | Ref | 7 | |
| Yoon, 1995 | Seoul, Korea | Cohort | CA | Prosp | 50 (1) | 1852 | 31,8 | HCA | 58 | Ref | 30 | NA | 7 | |||
| Zanardo, 2008 | Padua, Italy | Cohort | CA-IVH | Prosp | 287 (1) | 1146 | 29,3 | 48 | 80 | HCA | 24 | Ref | 12 | 1 | Ref | 7 |
CA, chorioamnionitis; IVH, intraventricular hemorrhage; NOS, Newcastle-Ottawa Scale; ACS, antenatal corticosteroids.
a
Abbreviations for study design: Ca-Co, case-control study; Perspective, CA, study analyzed IVH as outcome of chorioamnionitis; Perspective, IVH, study analyzed chorioamnionitis as risk factor for IVH; Perspective, CA-IVH, study analyzed the association between chorioamnionitis and IVH as primary outcome. Prosp, prospective; Retro, retrospective;
b
Chorioamnionitis category: CCA, clinical chorioamnionitis; HCA, histological chorioamnionitis; HCA & F, histological chorioamnionitis with funisitis mentioned separately. HCA and/or CCA, chorioamnionitis defined as positive when infants had histological or clinical chorioamnionitis; Microbiol, microbiological chorioamnionitis.
c
Definition of chorioamnionitis: NoDes, no description; Des, clinical or histological description; Ref, defined according to cited article.
d
Definition of ROP: ICROP, International Classification of Retinopathy of Prematurity; Ref, defined according to cited article; Treat, laser treatment of ROP; NA, no diagnostic criteria mentioned.
Table 2.
Newcastle-Ottawa Quality assessment of included studies.
| First author, year | Perspective | Select. | Comp. | Outc. | Total | Reason for downgrade |
|---|---|---|---|---|---|---|
| Aden, 2013 | IVH | 4 | 0 | 2 | 6 | No adjustment |
| Ahn, 2013 | CA | 4 | 1 | 3 | 8 | Only adjusted for 1 factor |
| Alexander, 1998 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Arayici, 2004 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Austeng, 2010 | CA | 3 | 2 | 3 | 8 | No CA definition |
| Babnik, 2006 | CA-IVH | 4 | 0 | 3 | 7 | No adjustment |
| Barrera-Reyes, 2011 | CA | 4 | 0 | 2 | 6 | No adjustment |
| Baumert, 2008 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Been, 2009 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Bermick, 2016 | IVH | 3 | 2 | 3 | 8 | No CA definition |
| Bordigato, 2010 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Botet, 2010 | CA | 4 | 1 | 3 | 8 | Only adjusted for 1 factor |
| Bry, 2015 | CA | 4 | 0 | 2 | 6 | No adjustment |
| Dalton, 2015 | IVH | 3 | 0 | 3 | 6 | No CA definition |
| Dempsey, 2005 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Dexter, 2000 | CA | 4 | 0 | 2 | 6 | Loss to follow up, no adjustment |
| Ecevit, 2014 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Elimian, 2000 | CA | 4 | 2 | 3 | 9 | |
| Erdemir, 2013 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Fung, 2003 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Gagliardi, 2014 | CA | 4 | 2 | 3 | 9 | |
| Garcia-Munoz Rodrigo, 2014 | CA | 4 | 2 | 3 | 9 | |
| Gawade, 2013 | IVH | 3 | 0 | 3 | 6 | No CA definition, no adjustment |
| Gonzalez-Luis, 2002 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Gray, 1997 | CA | 4 | 0 | 3 | 7 | |
| Hendson, 2011 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Hitti, 2001 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Holcroft, 2003 | IVH | 2 | 0 | 3 | 5 | No IVH definition, no adjustment |
| Kallankari, 2010 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Kaulkola,2006 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Kidokoro | IVH | 4 | 1 | 3 | 8 | Only adjusted for 1 factor |
| Kim, 2015 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Kirchner, 2007 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Klebermans-Schrehof | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Kosuge, 2000 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Lau, 2005 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Lee Hyun Ju, 2011 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Lee Ju Young, 2010 | IVH | 4 | 1 | 3 | 8 | Only adjusted for 1 factor |
| Lim, 2011 | IVH | 4 | 2 | 3 | 9 | |
| Linder, 2003 | IVH | 4 | 2 | 3 | 9 | |
| Liu, 2014 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Logan, 2013 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Lu, 2016 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Mehta, 2006 | CA-IVH | 4 | 0 | 3 | 7 | No adjustment |
| Mestan, 2010 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Miyazaki, 2016 | CA | 4 | 2 | 3 | 9 | |
| Morales, 1987 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Mu, 2008 | CA | 4 | 1 | 3 | 8 | Only adjusted for 1 factor |
| Nasef, 2013 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Ogunyemi, 2003 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Oh, 2015 | IVH | 4 | 2 | 3 | 9 | |
| Oh, 2018 | CA | 4 | 2 | 3 | 9 | |
| Ohyama, 2002 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Osmanagaoglu, 2005 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Pappas, 2014 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Perrone, 2012 | CA | 4 | 0 | 3 | 7 | No IVH definition |
| Polam, 2005 | CA | 4 | 0 | 2 | 6 | Loss to follow up, no adjustment |
| Poralla, 2012 | IVH | 4 | 0 | 2 | 6 | No IVH definition |
| Richardson, 2006 | CA | 4 | 0 | 2 | 6 | No IVH definition, no adjustment |
| Rocha, 2006 & Rocha, 2007 | CA | 4 | 2 | 3 | 9 | |
| Rodríguez-Trujillo, 2016 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Rong, 2012 | IVH | 4 | 2 | 2 | 8 | No CA definition |
| Ryckman, 2011 | IVH | 3 | 0 | 3 | 6 | No CA definition, no adjustment |
| Salas, 2013 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Sarkar, 2005 | CA-IVH | 4 | 0 | 3 | 7 | No adjustment |
| Sato, 2011 | CA | 4 | 1 | 2 | 7 | No IVH definition, only adjusted for 1 factor |
| Seliga-Siwecka, 2013 | CA | 4 | 2 | 3 | 9 | |
| Shankaran, 2014 | IVH | 4 | 2 | 2 | 8 | |
| Smit, 2015 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Soraisham, 2009 | CA | 4 | 2 | 3 | 9 | |
| Soraisham, 2013 | CA | 4 | 0 | 2 | 6 | Loss to follow up, no adjustment |
| Suarez, 2001 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Suppiej, 2009 | CA | 4 | 0 | 2 | 6 | Loss to follow up, no adjustment |
| Trevisanuto, 2010 | CA | 4 | 1 | 3 | 8 | Only adjusted for 1 factor |
| Tsiartas, 2013 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Vaihinger, 2013 | IVH | 4 | 2 | 3 | 9 | |
| van Vliet, 2012 | CA | 4 | 0 | 2 | 6 | No adjustment |
| Vergani, 2004 | IVH | 4 | 0 | 3 | 7 | No adjustment |
| Watterberg, 1999 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Wirbelauer, 2011 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Xu, 2012 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Yamada, 2015 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Yanowitz, 2006 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Yoon, 1995 | CA | 4 | 0 | 3 | 7 | No adjustment |
| Zanardo, 2008 | CA-IVH | 4 | 0 | 3 | 7 | No adjustment |
Select., selection; Comp., comparability; Outc., outcome; CA, chorioamnionitis; IVH, intraventricular hemorrhage.
The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.