Table 1:

Clinical and demographic characteristics

Characteristic	Overall (n = 175)^{^a}	No Cardiorespiratory Event (n = 153)^{^a}	Cardiorespiratory Event (n = 22)^{^a}	P Value^{^b}
Female sex	96 (55%)	82 (54%)	14 (64%)	.376
Age (m)	28.93 (23.21)	30.11 (24.17)	20.43 (11.76)	.004
Weight (kg)	13.00 (10.00–15.65)	13.00 (9.90–16.00)	11.30 (10.00–14.50)	.228
Bronchial hyperreactivity	19 (11%)	19 (12%)	0 (0%)	.136
Rhinitis	1 (1%)	1 (1%)	0 (0%)	>.999
Previous bronchiolitis	5 (3%)	5 (3%)	0 (0%)	>.999
Upper respiratory tract infections <15 days	8 (5%)	8 (5%)	0 (0%)	.598
Parental smoking	9 (5%)	7 (5%)	2 (9%)	.315
No clinical history	137 (78%)	117 (76%)	20 (91%)	.169

↵a Data are No. (%), mean (SD), median (25th–75th percentiles).
↵b Determined by the Pearson χ² test; Welch 2-sample t test; Fisher exact test; Wilcoxon rank-sum test.