Table 1.

Summary of results on the length of hospital stay (in days), grouped by co-infected virus

Study	Virus coinfected	Mono-infection	Co-infection	Notes
De Paulis, 2011 [23]	Any viruses	8 (6-10)	8 (6-12)	Median (IQR)
Espinola, 2012 [18]	Any viruses	2-12	2-15	Range
Falkenstein-Hagander, 2014 [41]	Any viruses	5.0 (3.0-6.0)	3.0 (3.0-5.0)	Median (IQR)
Gagliardi, 2013 [19]	Any viruses	8	8	Median
Gokce, 2018 [26]	Any viruses	7.2 ± 3.8	7.5 ± 4.7	Mean±SD
Janahi, 2017 [27]	Any viruses	81%	88%	Proportion of ≥4 d of stay
Kelly, 2015 [28]	Any viruses	5.1(2.1-8.0)	4.0(2.1-9.0)	Median (IQR)
Mansbach, 2012 [20]	Any viruses	48%	51%	Proportion of ≥3 d of stay
Petrarca, 2018 [33]	Any viruses	5 (1-27)	5 (2-12)	Median (range)
Yu, 2010 [37]	Any viruses	7.2 ± 3.6	7.2 ± 2.0	Mean±SD
Aberle, 2005 [21]	RV	7.6 ± 0.3	7.4 ± 0.4	Mean±SEM
de Silva, 2013 [7]	RV	6.1* in 0-5m, 5.9* in 6m-3y	10.8 ± 3.4 in 0-5m, 5.6 ± 0.5 in 6m-3y	Mean±SD
Janahi, 2017 [27]	RV	81%	84%	Proportion of ≥4 d of stay
Kwon, 2019 [38]	RV	5 (2-12)	4 (3-13)	Median (range)
Mansbach, 2012 [20]	RV	48%	54%	Proportion of ≥3 d of stay
Marguet, 2009 [32]	RV	6 (5-8)	5 (4-6)	Median (IQR)
Petrarca, 2018 [33]	RV	5 (1-27)	5 (3-9)	Median (range)
Janahi, 2017 [27]	Any viruses minus RV	81%	91%	Proportion of ≥4 d of stay
Mansbach, 2012 [20]	Any viruses minus RV	48%	47%	Proportion of ≥3 d of stay
Ali, 2010 [22]	hMPV	4 (3-6.2)	8.5 (4-9.7)	Median (IQR)
Caracciolo, 2008 [40]	hMPV	3.5 ± 3.0	4.1 ± 2.1	Mean±SD
Foulongne, 2006 [24]	hMPV	4 (2-5)	7 (4-8)	Median (IQR)
Aberle, 2005 [21]	ADV	7.6 ± 0.3	7.8 ± 0.9	Mean±SEM

RV – rhinovirus, hMPV – human metapneumovirus, ADV – adenovirus, IQR – interquartile range, SD – standard deviation, SEM – standard error of the mean, m – month, y – year

*Standard deviation was not available.