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Table 1 Descriptive statistics of the study population in KLoSA, 2016–2020

From: Particulate matters (PM2.5, PM10) and the risk of depression among middle-aged and older population: analysis of the Korean Longitudinal Study of Aging (KLoSA), 2016–2020 in South Korea

 

Mean (SD) or n (%)

Total study participants

(n = 7674)

Age (years)

68.1±10.3

 53–64

3230 (42.1)

 65–74

2156 (28.1)

 75–84

1761 (23.0)

 > 85

527 (6.9)

Sex

 Male

3274 (42.7)

 Female

4400 (57.3)

Current smoking

 No

6826 (89.0)

 Yes

848 (11.0)

Current drinking

 No

5060 (65.9)

 Yes

2614 (34.1)

Education attainment

 Primary school and below

3039 (39.6)

 Middle and high school

3647 (47.5)

 College and above

988 (12.9)

Marital status

 Single, divorced, and widowed, Married and not living with spouse

1857 (24.2)

 Married and living with spouse

5817 (75.8)

Social contact

 Every other month or less often

1196 (15.6)

 Once a month or more often and less than once a week

1736 (22.6)

 Once a week or more often

4742 (61.8)

Self-reported health status

 Normal or bad

4394 (57.2)

 Good

3280 (42.7)

Exercise

 No

4985 (65.0)

 Yes

2689 (35.0)

Private Medical insurance

 No medical insurance

4915 (64.1)

 Having medical insurance

2759 (36.0)

Population density

 Low (< 161/km2)

976 (12.7)

 Mid (161–3591/km2)

2995 (39.0)

 High (≥ 3591/km2)

3703 (48.3)

Number of beds in hospitals per 1,000 persons

15.0 ± 9.5

Number of national basic livelihood beneficiaries

7341.5 ± 5899.0

Independent rate of finance of local government

27.2 ± 13.5

Proportion of basic pension beneficiaries

69.2 ± 11.1

  1. KLoSA Korean Longitudinal Study of Aging, SD standard deviation