Epidemiological association between multiple chemical sensitivity and birth by caesarean section: a nationwide case-control study

Table 1 Physician-diagnosed multiple chemical sensitivity according to sex and age in the primary survey

Age	Men (N = 64,675)	Women (N = 85,325)	Total (N = 150,000)
20–25 years*	35/1713	64/6362	99/8075
20–25 years*	2.0 (1.37–2.71)	1.0 (0.76–1.25)	1.2 (0.99–1.47)
26–30 years*	56/2746	71/11,474	127/14,220
26–30 years*	2.0 (1.51–2.57)	0.6 (0.48–0.76)	0.9 (0.74–1.05)
31–35 years*	74/4529	115/13,769	189/18,298
31–35 years*	1.6 (1.26–2.00)	0.8 (0.68–0.99)	1.0 (0.89–1.18)
36–40 years	59/6816	117/13,079	176/19,895
36–40 years	0.9 (0.65–1.09)	0.9 (0.73–1.06)	0.9 (0.75–1.01)
41–45 years*	60/10,311	166/13,181	226/23,492
41–45 years*	0.6 (0.44–0.73)	1.3 (1.07–1.45)	1.0 (0.84–1.09)
46–50 years*	64/10,880	95/10,222	159/21,102
46–50 years*	0.6 (0.44–0.73)	0.9 (0.74–1.12)	0.8 (0.64–0.87)
51–55 years*	62/10,921	93/7748	155/18,669
51–55 years*	0.6 (0.43–0.71)	1.2 (0.96–1.44)	0.8 (0.70–0.96)
56–60 years*	45/8672	61/5277	106/13,949
56–60 years*	0.5 (0.37–0.67)	1.2 (0.87–1.44)	0.8 (0.62–0.90)
61–65 years^*	49/8087	45/4213	94/12,300
61–65 years^*	0.6 (0.44–0.78)	1.1 (0.76–1.38)	0.8 (0.61–0.92)
Total	504/64,675	827/85,325	1331/150,000
Total	0.8 (0.71–0.85)	1.0 (0.90–1.03)	0.9 (0.84–0.93)

The values in the upper rows represent the number of subjects with multiple chemical sensitivity/the total number of subjects. The values in the lower rows are the percentages (95% confidence intervals)
*P < 0.01, significant difference between men and women using the chi-squared test

ISSN: 1476-069X