Table 3.

Comparisons of the incidence of chromosomal abnormalities between the three groups according to the maternal age (Odds ratios and p-values).

	≤30 (n)	31–35 (n)	OR (95% CI)	p	>36 (n)	OR (95% CI)	p
Abnormal	115	130	1.52 (1.07–2.16)	0.018	187	3,25 (2.26–4.66)	< 0.0001
Trisomy	56	81	1.88 (1.26–2.81)	0.0017	149	4.92 (3.35–7.21)	< 0.0001
Triploidy	30	24	0.64 (0.24–1,17)	0.152	12	0.19 (0.09–0.39)	< 0.0001
Monosomy	19	16	0.89 (0.43–1.85)	0.771	12	0.34 (0.16–0.74)	0.0066
Trisomy 16	22	25	0.86 (0.43–1.74)	0.678	29	0.31 (0.15–0.62)	0.0009
Trisomy 22	0	10	16.59 (0.95–289.31)	0.054	35	35.03 (2.11–581.6)	0.013
Trisomy 21	7	9	0.87 (0.30–2.50)	0.803	13	0.66 (0.25–1.77)	0.419
Trisomy 15	0	4	6.56 (0.34–124.34)	0.210	22	19.94 (1.18–334.53)	0.037
Trisomy 13	7	7	0.66 (0.21–2.00)	0.465	6	0.29 (0.09–0.91)	0.034
Trisomy 14	7	4	0.36 (0.10–1.30)	0.121	5	0.24 (0.07–0.80)	0.020
Other abnormalities	10	10	1.10 (0.45–2.70)	0.828	14	1.43 (0.62–3.30)	0.389