A Cross-Sectional Study of Risk Factors for Irritable Bowel Syndrome in Children 8–13 Years of Age in Suzhou, China

Table 1

Demographic characteristics-specific prevalence of IBS in children.

	Number of cases	(%)	Total surveyed 𝑛^†	𝑧/𝜒^2-value	𝑃 value
Age (years)
8	50	13.40	374	2.796*	0.0026
9	106	12.70	832
10	171	11.20	1533
11	191	10.17	1883
12	207	10.20	2025
13	74	9.40	784
Sex
Male	403	10.30	3917	2.015	0.15
Female	402	11.30	3555
Annual family income (RMB)
≤12,000	117	12.00	979	3.84	0.27
12,001–20,000	75	9.90	758
20,001–36,000	108	9.60	1129
>36,000	64	11.30	567
Gestational age (weeks)
≤35	25	10.30	244	0.712	0.87
35^+1–37	68	10.50	651
37^+1–40	214	11.20	1904
>40	48	10.20	471
Birth weight (kg)
<2.5	86	11.20	765	4.77	0.09
2.5–4.0	537	11.50	4671
>4.0	28	7.70	362
Weight (kg)
≤30	250	11.59	2157	6.55	0.25
30.1–35	164	11.29	1453
35.1–40	121	10.34	1170
>40	161	10.23	1574

∗Cochran-Armitage trend test.
†Due to missing cases, the total number is less than 7472.