Table 2.

Adjusted odds ratios for obesity and confidence intervals using two methods for the National Health Survey

Covariates	Odds ratio	95% CIa (Without dichotomizing)	95% CI (dichotomizing)	Relative length of CI (dichotomizing/without dichotomizing)
Place of residence	2.04(2.13)b	1.916–2.194	1.915–2.369	1.63
Age	1.03(1.02)	1.026–1.032	1.017–1.026	1.50
Years of education	0.99(0.98)	0.979–0.996	0.968–0.993	1.47
Smoking	0.69(0.65)	0.553–0.856	0.468–0.916	1.48
Marital status	1.24(1.48)	1.150–1.323	1.312–1.668	2.06
Lower-middle economy index	1.36(1.37)	1.246–1.475	1.206–1.554	1.52
Upper-middle economy index	1.31(1.29)	1.205–1.426	1.136–1.468	1.50
High Economy Index	1.29(1.25)	1.155–1.443	1.094–1.425	1.15

^aconfidence interval

^bwithout dichotomizing(dichotomizing)