Table 4. Estimates of the regression coefficients and corresponding 95% confidence intervals (CI) for the model stratified by age and parity.

Variables	Regression Coefficients	95% CI
Intercept	1.546	(1.438, 1.654)*
Age Group 2	-0.236	(-0.361, -0.110)*
Age Group 3	-0.335	(-0.463, -0.206)*
Parous	-0.066	(-0.098, -0.034)*
Day/10	-0.792	(-0.992, -0.592)*
(Day/10)2	0.353	(0.244, 0.461)*
(Day/10)3	-0.042	(-0.062, -0.023)*
(Age Group 2):(Day/10)	0.216	(0.041, 0.391)*
(Age Group 3):(Day/10)	0.365	(0.188, 0.543)*
(Age Group 2):(Day/10)2	-0.044	(-0.044, 0.026)
(Age Group 3):(Day/10)2	-0.091	(-0.142, -0.039)*

*Significant at the 0.05 level.