Table 1.
Baseline characteristics of included study.
| Author | Year | Country | Case | Control | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Total | M/F | Gestation, weeks/months | Birthweight/g | Total | M/F | Gestation, weeks/months | Birthweight, g | |||
| Saigal | 1982 | Canada | 47 | 30/17 | 39 ± 2.2 w | 3130 ± 657 | 46 | 29/17 | 39 ± 2.5 w | 3120 ± 645 g |
| Harris | 1984 | Sweden | 42 | 51 | ||||||
| Kumar | 1984 | USA | 17 | 7.6 (6.5-10.9) m | 21 | 7.4 (6.5-10.9) m | ||||
| Hicks | 1993 | USA | 34 | 2002 | ||||||
| Fowler | 1997 | USA | 307 | 158/149 | 201 | 90/111 | ||||
| Shan | 2009 | China | 52 | 21 | ||||||
| Jim | 2015 | China | 14 | 27.9 ± 2.6 w | 1093.7 ± 251.4 | 41 | 29.2 ± 2.5 | 1153.7 ± 235.7 g | ||
| Uematsu | 2016 | Japan | 54 | 23/31 | 39 (36-41) w | 2634 (2497-2771) | 106 | 53/53 | 38 w (23-42 w) | 2516-2783 g |
| Jin | 2016 | USA | 186 | 96/90 | 51 | 35/16 | 1750-4170 g | |||
| Korndewal | 2017 | The Netherlands | ||||||||
| Kotovich | 2017 | Israel | 90 | 33.1 ± 2.0 w | 199 | 31.8 ± 2.3 w | ||||
| Lanzieri | 2017 | USA | 92 | 53/39 | 51 | 37/14 | ||||
| Pathirana | 2020 | South Africa | 46 | 25/21 | 38 (36-40) w | 2845 (2455-3190) | 84 | 43/41 | 38 (36-39) w | 2902.5 (2595-3195) g |