Table 1.

Demographic characteristics of 1-year and 2-year-old participants

Variable	1-year-old participants			2-year-old participants
	Cases (n*=308)	Controls (n=292)	P-value	Cases (n=214)	Controls (n=209)	P-value
Age (months) (median/IQR)	12.41 (11.48–13.66)	12.48 (11.72–13.07)	0.820	24.63 (23.87–25.46)	23.90 (23.18–24.73)	<0.001
Gender male (n/%)	174 (56.5)	155 (53.1)	0.401	116 (54.2)	95 (45.5)	0.072
Black African Race (n/%)	308 (100)	292 (100)	1.00	214 (100.0)	209 (100.0)	1.00
Weight (kg) (median/IQR)	9.9 (9.0–10.6)	9.8 (8.8–10.5)	0.118	12.0 (10.9–13.3)	11.6 (10.6–12.6)	0.007
Height (cm) (median/IQR)	74 (72–77), 54–89	74 (72–77), 62–88	0.621	87 (85–90)	86 (83–89)	0.051
Birth weight (g) (median/IQR)	3095 (2840–3400)	3138 (2900–3380)	0.124	3102 (2895–3400)	3175 (2855–3445)	0.319
HIV status (n/%)
Unexposed	229 (74.4)	214 (73.3)		157 (73.4)	150 (71.8)
Exposed uninfected	67 (21.7)	74 (25.3)	0.101	45 (21.0)	52 (24.9)	0.531
Infected	11 (3.6)	4 (1.3)		3 (1.4)	1 (0.5)
Unknown	1 (0.3)	0 (0.0)		9 (4.2)	6 (2.9)
Underlying medical conditions (n/%)	0 (0.0)	0 (0.0)	N/A	0 (0.0)	0 (0.0)	N/A
Age (months) at RSV† admission (median/IQR)	4.48 (2.26–6.85)	N/A	N/A	4.48 (2.26–6.85)	N/A	N/A
Time (months) between RSV admission and visits (median/IQR)	7.60 (4.77–10.68)	N/A	N/A	20.82 (16.51–22.79)	N/A	N/A
Duration of RSV admission (days) (median/IQR)	2 (1-4)	N/A	N/A	2 (1-5)	N/A	N/A
Received supplemental oxygen during RSV admission (n/%)	103 (34.7)	N/A	N/A	69 (34.9)	N/A	N/A

*n: number.

†Underlying medical conditions: congenital (ex. congenital cardiac disease, hydrocephalus), genetic (ex. trisomy 21) or medical diagnosis (ex. neurological disability, such as neuromuscular disease or cerebral palsy, hepatic abnormalities such as biliary atresia, and musculoskeletal disorders such as osteogenesis imperfecta) that may affect respiratory function.

RSV, respiratory syncytial virus.