Clarifying the relationship and analyzing the influential factors of bronchial asthma in children with attention-deficit hyperactivity disorder

Table 3 Univariate analysis of factors influencing the asthma comorbidity rate in children with attention-deficit hyperactivity disorder

Parameter	Comorbid group (n = 25)	Non-comorbid group (n = 158)	χ2/t	P value
Sex (cases)
Male	13	83	0.002	0.961
Female	12	75
Age (yr, mean ± SD)	9.35 ± 1.72	9.49 ± 1.63	0.396	0.693
Ethnicity (cases)
Han	23	148	0.098	0.754
Non-Han	2	10
Feeding method (cases)
Breastfed	16	105	0.395	0.821
Formula-fed	3	23
Mixed feeding	6	30
Gestational age at birth (wk, cases)
Full-term	21	134	0.642	0.726
Preterm	3	13
Postterm	1	11
Brain injury (cases)
Yes	1	2	1.007	0.317
No	24	156
Family history of asthma/allergic diseases (cases)
Yes	9	32	32.821	< 0.001
No	16	517
Maternal pregnancy complications (cases)
Present	16	15	45.581	< 0.001
Absent	9	143
Maternal use of asthma/allergy medications during pregnancy (cases)
Yes	18	20	46.201	< 0.001
No	7	138
Maternal smoking history during pregnancy (cases)
Yes	4	22	0.076	0.782
No	21	136
Maternal anxiety and depression during pregnancy (cases)
Yes	15	13	44.641	< 0.001
No	10	145
Parental relationship status (cases)
Good	10	131	36.952	< 0.001
Average	4	19
Poor	11	8