TABLE 2.

Gompertz proportional hazard models of postreproductive mortality risks in three natural fertility populations (entries are hazard ratios)

Variable	Old Quebec		SLSJ		Utah
	Hazard ratio	P-value	Hazard ratio	P-value	Hazard ratio	P-value
First birth interval	1.011	0.611	1.078	0.080	1.001	0.364
Age at first birth	1.005	0.342	1.009	0.366	0.992	0.055
Age at last birth (a)	0.974	<0.001	0.964	0.001	0.978	<0.001
Total parity (b)	1.016	0.026	1.032	0.047	1.031	<0.001
Interaction a × b	0.998	0.021	0.997	0.059	0.998	0.017
Infant mortality low (=1 if <20%)	0.886	0.001	0.857	0.009	1.030	0.638
Birth year	0.997	<0.001	1.000	0.994	0.996	<0.001
Age at death ofspouse	0.995	<0.001	1.002	0.534	0.996	<0.001
Immigrant status	0.939	0.324	0.893	0.061
Urban residence	1.191	<0.001	0.799	<0.001
Live in the western region	0.873	<0.001
LDS					0.929	0.003
Gamma	0.088	<0.001	0.089	<0.001	0.123	<0.001
Theta	0.031	0.030	0.030	0.179	0.222	<0.001
N	5,477		1,610		11,395