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Table 1 Demographic characteristics of study participants (n = 2867)

From: Investigation of the relationship between sleep-related parameters and metabolic syndrome (MetS) among youths in the Southeast of Iran

Characteristics

All (n = 2867)

Non-MetS (n = 2645)

MetS (n = 222)

P-Value

Age - yr. no. (%)

≤ 20

722 (25.19%)

700 (96.95%)

22 (3.05%)

0.000

21–30

1258 (43.89%)

1161 (92.29%)

97 (7.71%)

≥ 30

886 (30.91%)

783 (88.37%)

103 (11.63%)

Mean ± SD

25.82 ± 6.07

25.59 ± 6.10

28.60 ± 4.97

0.000

Gender - no. (%)

Female

1621(56.54%)

1463 (90.25%)

158 (9.75%)

0.000

Male

1246 (43.46%)

1182 (94.86%)

64 (5.14%)

Education.years- no. (%)

≤ 12 years

1770 (61.80%)

1622 (91.64%)

148 (8.36%)

0.120

≥ 13 years

1094 (38.20%)

1020(93.24%)

74 (6.76%)

Mean ± SD

12.31 ± 3.01

12.33 ± 3.01

11.97 ± 3.10

0.086

Physical activity score - no. (%)

Median(IQR)

0(0-120)

0(0-120)

0(0–90)

0.113

BMI - no. (%)

< 25

1595 (55.77%)

1576 (98.81%)

19 (1.19%)

0.000

25-29.9

816 (28.53%)

731 (89.58%)

85 (10.42%)

≥ 30

449 (15.70%)

331 (73.72%)

118 (26.28%)

Mean ± SD

26.16 ± 53.62

25.74 ± 55.73

31.19 ± 10.22

0.145

Alcohol consumption - no. (%)

Yes

688 (24.00%)

648 (94.19%)

40 (5.81%)

0.030

No

2179 (76.00%)

1997(91.65%)

182 (8.35%)

Cigarette smoking - no. (%)

Yes

828 (28.88%)

773 (93.36%)

55 (6.64%)

0.160

No

2039 (71.12%)

1872 (91.81%)

167 (8.19%)

Hookah consumption - no. (%)

Yes

1474 (51.43%)

1378 (93.49%)

96 (6.51%)

0.013

No

1392 (48.57%)

1266 (90.95%)

126 (9.05%)

Bedtime

Before or on 12:00 am

2028 (70.74%)

1869 (92.16%)

159 (7.84%)

0.763

After 12:00 am

839 (29.26%)

776 (92.49%)

63 (7.51%)

Wake time

Before or on 6:00 am

653 (22.78%)

604 (92.50%)

49 (7.50%)

0.794

After 6:00 am

2214 (77.22%)

2041 (92.19%)

173 (7.81%)

napping

Yes

1162 (40.53%)

1071 (92.17%)

91 (7.83%)

0.884

No

1705 (59.47%)

1574 (92.32%)

131 (7.68%)

Night shift work

Yes

150 (5.23%)

145 (96.67%)

5 (3.33%)

0.038

No

2717 (94.77%)

2500 (92.01%)

217 (7.99%)

Sleep duration per night

Short

317 (11.06%)

302 (95.27%)

15 (4.73%)

0.104

Normal

1888 (65.85%)

1735 (91.90%)

153 (8.10%)

Long

662 (23.09%)

608 (91.84%)

54 (8.16%)

Mean ± SD

7.65 ± 1.44

7.65 ± 1.45

7.63 ± 1.34

0.822

Sleep duration per day

   

< 6

99 (3.45%)

91 (91.92%)

8 (8.08%)

0.321

6–7

682 (23.79%)

631 (92.52%)

51 (7.48%)

8–9

1387 (48.38%)

1268 (91.42%)

119 (8.58%)

≥ 10

699 (24.38%)

655 (93.71%)

44 (6.29%)

Mean ± SD

8.53 ± 1.71

8.53 ± 1.72

8.42 ± 1.52

0.330

  1. Abbreviation: BMI: body mass index