TABLE 4—

Logistic Regression Analysis for Completion of Immunization in Infants Aged 1 Year in the National Maternal and Infant Health Survey Sample Before and After Implementation of National Health Insurance (NHI): Taiwan, 1989 and 1996

	Pre-NHIa			Post-NHIb
Variable	Coefficient	P Value	Odds Ratio	Coefficient	P Value	Odds Ratio
Constant	0.4270	0.273	. . .	0.7512	0.024**	. . .
Infant’s characteristics
Gender	0.0340	0.768	1.0346	−0.1545	0.160	0.8568
Gestation period	−0.0747	0.827	0.9281	0.4814	0.015**	1.6183
Birth order	0.2607	0.044**	1.2978	0.5001	0.001***	1.6489
Hospital birth	−0.2405	0.054*	0.7863	0.2352	0.039**	1.2652
Well-baby care	−0.1367	0.257	0.8722	0.4169	0.001***	1.5172
Principal caregiver
Grandparents	−0.0136	0.930	0.9865	0.2890	0.839	1.0293
Babysitter	−0.3831	0.048**	0.6817	−0.2677	0.122	0.7651
Maternal characteristics
Age, y
25–34	0.1687	0.217	1.1837	0.0356	0.803	1.0363
≥35	−0.1284	0.673	0.8795	−0.1867	0.408	0.8297
Education
Junior high	0.2365	0.192	1.2669	0.2448	0.325	1.2774
Senior high	0.2800	0.105	1.3232	0.3760	0.110	1.4564
Junior college	−0.2284	0.381	0.7958	0.3368	0.224	1.4005
College and above	−0.2882	0.358	0.7496	0.6395	0.047**	1.8955
Occupation
Government	0.6462	0.023**	1.9083	0.0454	0.824	1.0464
Laborer	0.2904	0.120	1.3369	0.1302	0.392	1.1390
Farmerc	0.3495	0.622	1.4184	. . .	. . .	. . .
Businesswoman	0.3339	0.101	1.3964	0.0144	0.932	1.0145
Other	0.2524	0.334	1.2871	−0.0026	0.992	0.9974
Geographic characteristics
Central	0.1603	0.277	1.1739	−0.0144	0.918	0.9857
South	−0.1412	0.345	0.8683	−0.1033	0.465	0.9019
East	0.3129	0.228	1.3674	−0.1780	0.388	0.8369

^aLog likelihood = −884.1923; LR χ² (21) = 33.9; Prob > χ² = .036; pseudo R² = .018; n = 1398.

^bLog likelihood = −1154.7057; LR χ² (20) = 67.1; Prob > χ² = .0001; pseudo R² = .028; n = 3171.

^c In the post-NHI period farmer ≠ 0 predicts success perfectly. The dummy variable-farmer was dropped and 13 observations were not used.

*P < .1; **P < .05; ***P < .01.