Table 2.

Distribution of atopic factors in males and females per age group.

MALES
Atopic factors	Age group
	All patients (N=360) n (%)	0–3 months (N=73) n (%)	4–12 months (N=181) n (%)	>12 months (N=106) n (%)	P value*
Previous episode of bronchiolitis	207 (57.5)	11 (15.1)	110 (60.8)	86 (81.1)	<0.001
Hospitalization due to bronchiolitis	143 (39.7)	8 (11)	74 (40.9)	61 (57.5)	<0.001
Past medical history
Asthma	58 (16.1)	3 (4.1)	25 (13.8)	30 (28.3)	<0.001
Atopic dermatitis	71 (19.7)	6 (8.2)	42 (23.2)	23 (21.7)	0.021
Allergic rhinitis	52 (14.4)	3 (4.1)	22 (12.2)	27 (25.5)	<0.001
Household allergen exposure
Bird	38 (10.6)	7 (9.6)	13 (7.2)	18 (17)	0.032
FEMALES
Atopic factors	Age group
	All patients (N=240) n (%)	0–3 months (N=57) n (%)	4–12 months (N=108) n (%)	>12 months (N=75) n (%)	P value*
Previous episode of bronchiolitis	110 (45.8)	4 (7)	54 (50)	52 (69.3)	<0.001
Hospitalization due to bronchiolitis	82 (34.2)	3 (5.3)	39 (36.1)	40 (53.3)	<0.001
PICU admission due to bronchiolitis	14 (5.8)	0 (0)	6 (5.6)	8 (10.7)	0.022
Past medical history
Asthma	31 (12.9)	0 (0)	11 (10.2)	20 (26.7)	<0.001
Atopic dermatitis	31 (12.9)	2 (3.5)	18 (16.7)	11 (14.7)	0.049
Allergic rhinitis	33 (13.8)	3 (5.3)	12 (11.1)	18 (24)	0.005
Maternal asthma during pregnancy	27 (11.2)	4 (7)	8 (7.4)	15 (20)	0.015

PICU=Pediatric Intensive Care Unit.

^*P-values were computed using Chi-square or Fisher’s exact test, as appropriate.

^*All other atopic factors not shown were found to be statistically non-significant.