Table 4.

Stratified analysis, linear trend for functional limitations and disability

	Functional limitations		Disabilities
	Age-adjusted	Full modela	Age-adjusted	Full modela
Sex
Female	0.964 (0.954–0.975)***	0.972 (0.961–0.984)***	0.963 (0.952–0.973)***	0.967 (0.956–0.979)***
Male	0.972 (0.959–0.986)***	0.978 (0.963–0.992)**	0.972 (0.958–0.986)***	0.979 (0.964–0.993)**
Trend * sex		P = 0.625		P = 0.280
Age
67–74	0.963 (0.951–0.976)***	0.972 (0.959–0.986)***	0.960 (0.947–0.972)***	0.967 (0.954–0.981)***
75–79	0.970 (0.954–0.986)***	0.976 (0.958–0.994)**	0.967 (0.950–0.983)***	0.975 (0.958–0.993)**
80–84	0.969 (0.950–0.989)**	0.974 (0.953–0.994)**	0.977 (0.957–0.996)*	0.981 (0.961–1.001)
85+	0.982 (0.956-1.008)	0.987 (0.960-1.015)	0.976 (0.950-1.002)	0.977 (0.951-1.005)
Trend * agegroup		P = 0.104		P = 0.045
Educ. level (years)
Lower school (<9 years)	0.976 (0.964–0.987)***	0.976 (0.964–0.987)***	0.972 (0.960–0.983)***	0.972 (0.961–0.984)***
High school (10–12 years)	0.973 (0.958–0.988)***	0.972 (0.957–0.988)***	0.970 (0.955–0.985)***	0.970 (0.955–0.985)***
University or college (>13 years)	0.980 (0.945–1.016)	0.976 (0.940–1.013)	0.987 (0.950–1.025)	0.983 (0.945–1.023)
Trend * educ. level dummy		P = 0.895		P = 0.666
Marital status
Married or cohabitating	0.968 (0.957–0.980)***	0.972 (0.959–0.984)***	0.969 (0.958–0.981)***	0.974 (0.962–0.986)***
Not married or cohabitating	0.970 (0.957–0.982)***	0.978 (0.965–0.991)**	0.964 (0.952–0.977)***	0.969 (0.956–0.982)***
Trend * marriage or cohabitating		P = 0.765		P = 0.508

Multivariate logistic regression analysis. P values are the significance-levels of the interaction terms between strata and survey years on the non-stratified dataset

* P < 0.05, ** P < 0.01, *** P < 0.001

^aTrends from the full model are adjusted for sex, age, education level, and marital status