. 2008 Jun 1;31(6):817–823. doi: 10.1093/sleep/31.6.817

Table 2.

Standardized Incidence Ratios and Observed Number of Cases of Obstructive Sleep Apnea Syndrome in Men and Women Aged 19–72 Years With at Least 1 Sibling Who has Obstructive Sleep Apnea

Age at diagnosis (years)	Men				Women
Age at diagnosis (years)	O	SIR	95% CI		O	SIR	95% CI
19–29	2	5.08	0.34	26.41	0
30–39	36	7.36^a	3.64^a	14.43^a	4	5.01	0.92	18.32
40–49	77	3.37^a	1.88^a	5.97^a	15	3.95^a	1.56^a	9.25^a
50–59	169	3.17^a	1.92^a	5.22^a	34	2.48^a	1.21^a	4.90^a
≥ 60	84	3.20^a	1.80^a	5.61^a	36	4.01^a	1.98^a	7.85^a
All	368	3.42^a	2.18^a	5.36^a	89	3.25^a	1.84^a	5.65^a

O refers to observed number of cases; SIR, standardized incidence ratio. Incidence ratios standardized for age, time period, income, and geographic region of residence. The reference group consisted of people who have siblings but whose siblings do not have obstructive sleep apnea.

95% confidence interval (CI) does not include 1.00.