Table 1 Baseline characteristics by outdoor LAN exposure levels.

From: Effects of exposure to outdoor light at night on blood lipids in China: a nationwide cross-sectional study

 

Quintile 1

(n = 2143)

Quintile 2

(n = 2199)

Quintile 3

(n = 2129)

Quintile 4

(n = 2239)

Quintile 5

(n = 2184)

Age (years), mean

59.1 ± 9.8

59.2 ± 9.8

59.8 ± 10.1

59.4 ± 9.6

59.1 ± 9.9

Women, n (%)

1125 (52.5)

1162 (52.8)

1115 (52.4)

1213 (54.2)

1197 (54.8)

High school or higher, n (%)

116 (5.4)

166 (7.6)

155 (7.4)

235 (10.5)

464 (21.3)

Current smoking, n (%)

647 (30.2)

632 (28.7)

663 (31.1)

612 (27.3)

584 (26.7)

Current drinking, n (%)

593 (27.7)

575 (26.1)

520 (24.4)

535 (23.9)

505 (23.1)

Household total income (10000 yuan), median (IQR)

1.3 (0.4–3.2)

1.8 (0.7–4.2)

2.2 (0.7–4.9)

2.3 (0.8–4.7)

4.1 (2.1–7.1)

PM 2.5 (µg/m3)

25.6 ± 12.9

35.1 ± 10.8

40.3 ± 12.6

48.5 ± 16.5

54.5 ± 17.5

Body mass index (kg/m2), mean

22.6 ± 3.4

22.9 ± 3.2

23.2 ± 3.5

23.9 ± 3.7

24.2 ± 3.4

Fasting glucose (mg/dl), mean

108.2 ± 37.6

108.5 ± 29.4

108.3 ± 32.1

110.4 ± 38.2

108.1 ± 32.2

Light at night (nW/cm2/sr), median (IQR)

1.7 (1.0–1.9)

3.3 (2.7–4.0)

6.4 (4.9–7.3)

11.8 (9.8–13.5)

42.3 (26.4–70.5)

LDL-cholesterol (mg/dl), mean

114.0 ± 33.9

115.0 ± 34.1

116.5 ± 33.0

116.3 ± 34.2

119.9 ± 34.0

Triglyceride (mg/dl), mean

125.7 ± 78.6

123.8 ± 75.4

121.2 ± 68.2

122.9 ± 74.0

131.1 ± 74.9

HDL-cholesterol (mg/dl), mean

53.5 ± 16.3

54.1 ± 15.2

51.1 ± 14.7

49.9 ± 14.5

49.1 ± 14.0

Total cholesterol (mg/dl), mean

192.5 ± 37.9

193.2 ± 38.6

191.6 ± 36.7

189.8 ± 37.2

192.1 ± 37.1

High LDL-cholesterol, n (%)

185 (8.6%)

213 (9.7%)

217 (10.2%)

219 (9.8%)

261 (12.0%)

High triglyceride, n (%)

294 (13.7%)

285 (13.0%)

257 (12.1%)

271 (12.1%)

303 (13.9%)

Low HDL-cholesterol, n (%)

439 (20.5%)

395 (18.0%)

504 (23.7%)

593 (26.5%)

617 (28.3%)

High total cholesterol, n (%)

228 (10.6%)

243 (11.1%)

225 (10.6%)

206 (9.2%)

224 (10.3%)

High LDL-cholesterol, high triglyceride, or low HDL-cholesterol, n (%)

713 (33.3%)

683 (31.1%)

776 (36.4%)

840 (37.5%)

903 (41.3%)

Dyslipidemia, n (%)

769 (35.9%)

722 (32.8%)

812 (38.1%)

853 (38.1%)

918 (42.0%)

  1. Values are means ± standard deviation, number (percentages), or median (quartile).
  2. PM2.5, fine particulate matter; LDL-cholesterol, low-density lipoprotein-cholesterol; HDL-cholesterol, high-density lipoprotein- cholesterol.
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