Table 1 Baseline characteristics of the study participants

Demographics

  Age, years

71.9 (69.3, 74.6)

71.9 (69.0, 75.0)

1.0

  BMI

29.1 (26.7, 31.7)

28.8 (26.0, 31.7)

.80

  Education, years

15.7 (14.1, 16.3)

17.0 (16.1, 18.0)

.01

Disease condition (range of scores)

  WOMAC-pain (0–20)

9.3 (7.4, 11.3)

7.7 (5.6, 9.8)

.25

  WOMAC-stiffness (0–8)

5.2 (4.5, 5.9)

4.3 (3.3, 5.3)

.16

  WOMAC- physical function (0–68)

35.0 (29.2, 40.9)

27.1 (19.6, 34.6)

.09

  WOMAC-total (0– 96)

49.5 (41.6, 57.4)

39.2 (29.7, 48.7)

.09

  SPPB Global (0–12)

9.2 (8.1, 10.3)

8.8 (7.6, 10.0)

.57

  SPPB-chair (0–4)

2.4 (1.7, 3.1)

1.9 (1.2, 2.7)

.36

  SPPB-balance (0–4)

3.6 (3.1, 4.0)

3.7 (3.3, 4.1)

.59

  SPPB-walk (0–4)

3.3 (3.0, 3.6)

3.1 (2.7, 3.5)

.49

  Comorbidities, no.

2.8 (1.7, 3.9)

1.4 (.8, 2.0)

.03

QOS and QOL (range of scores)

  PSQI Total (0–21)

6.5 (4.4, 8.6)

5.7 (3.9, 7.4)

.52

  PSQI-sleep efficiency (0–3)

.61 (.1, 1.2)

.61 (.15, 1.2)

1.0

  PSQI-sleep disturbance (0–3)

1.7 (1.5, 2.0)

1.5 (1.2, 1.8)

.18

  PSQI-sleep duration (0–3)

.44 (.1, .8)

.33 (.05,.51)

.65

  PSQI-sleep latency (0–3)

1.2 (.7, 1.7)

.76 (.6, 1.5)

.23

  PSQI-sleep quality (0–3)

1.1 (.7, 1.4)

.83 (.4, 1.4)

.38

  PSQI-Use sleep medications (0–3)

.67 (.1, 1.3)

.78 (.2, 1.4)

.78

  SF-12 PCS (0–100)

39.5 (36.4, 42.6)

37.8 (35.3, 40.3)

.37

  SF-12 MCS (0–100)

51.0 (48.2, 53.8)

51.7 (48.8, 54.6)

.72

  Cantril Current (0–10)

6.9 (6.0, 7.8)

7.8 (7.1, 8.5)

.11

  Cantril 5 years (0–10)

7.3 (6.5, 8.1)

7.8 (7.0, 8.5)

.41