Table III.

Trisomy rates of all 24 chromosomes between formaldehyde-exposed and control groups^a

Chromosome	IRRb	95% CIc	P-value
5	3.40	1.94–5.97	1.98E-05
19	2.07	1.24–3.46	0.0055
21	2.09	1.22–3.57	0.0071
1	1.91	1.15–3.17	0.012
20	2.49	1.21–5.14	0.013
16	1.72	1.05–2.80	0.031
7	1.88	0.98–3.61	0.056
18	1.74	0.96–3.15	0.067
2	1.88	0.96–3.68	0.067
13	2.51	0.91–6.91	0.075
12	1.53	0.95–2.47	0.083
22	1.92	0.90–4.09	0.090
9	1.69	0.88–3.23	0.11
X (M)d	1.74	0.87–3.45	0.11
14	1.40	0.82–2.40	0.22
8	1.37	0.82–2.31	0.23
Y	1.29	0.80–2.10	0.30
4	1.27	0.81–1.99	0.30
10	1.33	0.76–2.34	0.32
6	1.34	0.61–2.96	0.46
11	1.20	0.63–2.30	0.58
17	1.12	0.70–1.81	0.63
15	0.89	0.52–1.51	0.66
3	0.89	0.52–1.54	0.68

^aData listed according to P-values.

^bIRR, adjusted for age and sex, except for sex in the analysis of X and Y chromosomes.

^c95% confidence interval.

^dX chromosome in males.