Table 2 Multivariable Logistic Regression on Daytime Napping and Successful Aging

 0 min (ref)

–

–

–

–

 1–60 min

1.012 (0.829–1.234)

1. 270 (0.887–1.817)

1.004 (0.736–1.370)

0.818 (0.559–1.196)

  > 60 min

0.762 (0.583–0.996)

0.875 (0.516–1.484)

0.837 (0.550–1.276)

0.617 (0.387–0.984)

 Male (ref)

–

–

–

–

 Female

1.060 (0.804–1.396)

0.727 (0.433–1.222)

1.083 (0.706–1.662)

1.541 (0.922–2.573)

 60–64(ref)

–

–

–

–

 65–74

0.614 (0.507–0.745)

0.639 (0.447–0.914)

0.597 (0.443–0.804)

0.620 (0.429–0.897)

  ≥ 75

0.451 (0.327–0.621)

0.344 (0.189–0.625)

0.468 (0.274–0.798)

0.559 (0.320–0.978)

 No formal education (illiterate) (ref)

–

–

–

–

 Did not finish primary school

2.170 (1.606–2.933)

1.906 (1.092–3.326)

1.947 (1.192–3.180)

2.635 (1.541–4.504)

 Sishu/homeschool/elementary school

3.053 (2.280–4.087)

2.937 (1.717–5.022)

2.875 (1.801–4.589)

3.439 (2.018–5.861)

 Middle school and above

4.952 (3.685–6.656)

5.261 (3.098–8.934)

4.252 (2.640–6.849)

5.887 (3.394–10.209)

 Married and cohabited (ref)

–

–

–

–

 Other (Separated/divorced/widowed and never married)

0.783 (0.612–1.003)

0.995 (0.663–1.494)

0.757 (0.501–1.144)

0.590 (0.358–0.972)

 Rural area (ref)

–

–

–

–

 Urban area

1.271 (1.030–1.568)

1.591 (1.088–2.328)

1.070 (0.774–1.480)

1.391 (0.923–2.094)

  ≤ 2000 CNY (ref)

–

–

–

–

 2000 < x ≤ 10,000 CNY

1.232 (0.953–1.593)

1.042 (0.667–1.629)

1.278 (0.839–1.947)

1.447 (0.892–2.348)

 10,000 < x ≤ 25,000 CNY

1.177 (0.901–1.537)

0.932 (0.572–1.518)

1.268 (0.832–1.932)

1.340 (0.803–2.236)

  > 25,000 CNY

1. 456 (1.135–1.868)

1.039 (0.649–1.662)

1.429 (0.960–2.127)

2.010 (1.274–3.170)

 No (ref)

–

–

–

–

 Yes

1.078 (0.833–1.395)

0.845 (0.515–1.384)

1.220 (0.817–1.822)

1.157 (0.721–1.856)

 No (ref)

–

–

–

–

  < once a month

1.350 (1.033–1.764)

1.819 (1.123–2.948)

1.033 (0.679–1.571)

1.559 (0.933–2.606)

  ≥ once a month

0.930 (0.710–1.217)

0.911 (0.543–1.529)

0.785 (0.516–1.194)

1.224 (0.748–2.004)

 No (ref)

–

–

–

–

 Yes

1.353 (1.130–1.620)

1.185 (0.847–1.658)

1.351 (1.019–1.790)

1.545 (1.100–2.169)

  < 1 day/week (ref)

–

–

–

–

 1–2 days/week

1.078 (0.834–1.394)

1.272 (0.758–2.134)

0.843 (0.570–1.248)

1.366 (0.854–2.187)

 3–4 days/week

0.615 (0.452–0.837)

0.735 (0.433–1.248)

0.594 (0.374–0.943)

0.522 (0.245–1.111)

 5–7 days/week

0.659 (0.501–0.867)

0.802 (0.531–1.212)

0.468 (0.277–0.791)

0.843 (0.429–1.656)

 6 to less than 8 h (ref)

–

–

–

–

  < 6 h

0.926 (0.734–1.169)

–

–

–

  ≥ 8 h

0.936 (0.750–1.168)

–

–

–