Table 1 Control variables and the characteristics of the study participants (N = 1201).

From: A two-mediator serial mediation chain of the association between social isolation and impaired sleep in old age

Variable

%/M(± SD): Range

Age (in years)

66.14(± 11.85): 50–111

Sex

63.28% Female

36.72% Male

Setting

44.96% Rural

55.04% Urban

Income level

307.98 (± 338.79)

Educational level

86.18% None or primary

8.66% Secondary

5.16% Tertiary

Alcohol intake

68.50% No

31.50% Yes

Physical activity

3.01(± 1.47)

Self-rated health

3.44(± 0.84): 1–5

Pain interference

3.03(± 1.26): 1–5

Number of chronic physical Conditions

3.32(± 3.97): 0–5

Functional limitations

8.91(± 2.15): 7–28

  1. N valid frequency, M mean, SD standard deviation.