. Author manuscript; available in PMC: 2019 Jun 12.

Published in final edited form as: Demogr Res. 2014 Feb 7;30:413–428. doi: 10.4054/DemRes.2014.30.14

Table 2:

Odds ratios (with standard errors) for being subsequently infertile obtained from logistic regression for Gwembe Tonga women, men and women and men combined

	Women	Men	Pooled Women and Men

Age Group
20–24		Reference group
25–29	3.5 (0.3)^*	10.7 (2.4)^*	10.7 (2.4)^*
30–34	5.5 (0.6)^*	22.8 (5.4)^*	22.6 (5.4)^*
35–39	12.3 (1.4)^*	40.8 (10.0)^*	40.1 (9.8)^*
40–44^**	86.0 (10.5)^*	64.5 (16.2)^*	63.1 (15.8)^*
45–49^§		106.4 (27.2)^*	154.3 (38.9)^*
50–54		158.4 (42.8)^*
55+		338.5 (96.7)^*
Time Period
1950–1963		Reference group
1964–1972	2.0 (0.4)^*	2.1 (0.6)^*	2.1 (0.7)^*
1973–1981	2.3 (0.5)^*	3.2 (1.0)^*	2.6 (0.3)^*
1982–1990	3.5 (0.8)^*	5.6 (1.7)^*	4.2 (0.8)^*
1991–1999	12.5 (2.8)^*	18.5 (5.8)^*	14.5 (2.6)^*
Sex
Male			Reference group
Female			6.5 (1.6)^*
Sex and Age Interaction
Female^*25–29			0.3 (0.1)^*
Female^*30–34			0.2 (0.1)^*
Female^*35–39			0.3 (0.1)^*
Female^*40–44			0.8 (0.2)
Female^*45+			2.3 (0.7)
Intercept	0.01 (0.0)^*	0.002 (0.0)^*	0.002 (0.0)^*
Pseudo R²	0.32	0.29	0.31
Cases	1,405	1,021	2,426
Observations	20,069	16,141	36,210

Significant at the p<0.01 level

^**

For women only, the 40–44 age group includes all women age 40 and over.

^§

For the pooled model, the 45–49 age group includes all individuals age 45 and over