Table 4 Association between sleep quality score, sleep duration and the frailty index category

Sleep quality

0–4

Reference

Reference

Reference

Reference

Reference

Reference

Reference

Reference

5–9

2.30 (1.76, 3.03)**

2.93 (1.88, 4.56)**

1.89 (1.37, 2.61)**

1.91 (1.09, 3.34)*

1.96 (1.41, 2.71)**

2.05 (1.17, 3.61)*

2.04 (1.47, 2.84)**

2.12 (1.20, 3.74)*

10–14

4.17 (2.91, 5.99)**

6.82 (3.97, 11.72)**

2.58 (1.66, 4.02)**

2.72 (1.35, 5.48)*

2.64 (1.69, 4.13)**

2.74 (1.34, 5.61)*

2.91 (1.83, 4.61)**

2.96 (1.43, 6.16)*

15–20

7.89 (4.41, 14.11)**

41.90 (21.93, 80.03)**

3.39 (1.71, 6.71)**

10.93 (4.76, 25.14)**

3.34 (1.69, 6.62)**

9.88 (4.22, 23.14)**

3.83 (1.88, 7.83)**

11.00 (4.43, 27.27)**

Sleep duration

 ≥ 6 & < 9 h

Reference

Reference

Reference

Reference

Reference

Reference

Reference

Reference

 < 6 h

1.70 (1.15, 2.49)*

3.03 (1.85, 4.98)**

1.28 (0.81, 2.04)

2.00 (1.03, 3.88)*

1.26 (0.79, 2.00)

1.84 (0.93, 3.65)

0.88 (0.53, 1.44)

0.91 (0.42, 1.95)

 ≥ 9 h

1.51 (1.00, 2.28)*

1.56 (0.86, 2.82)

1.61 (0.98, 2.63)

1.32 (0.59, 2.95)

1.64 (1.00, 2.71)*

1.32 (0.58, 3.00)

1.97 (1.19, 3.28)*

1.73 (0.75, 3.98)