Skip to main content

Table 1 General characteristics of students with and without metabolic syndrome before and after matching

From: Association of sleep duration with metabolic syndrome and its components in children and adolescents; a propensity score-matched analysis: the CASPIAN-V study

Variables Before propensity score-matched After propensity score-matched
Without MetS (n = 3544) With MetS (n = 188) P-value Without MetS (n = 151) With MetS (n = 151) P-value*
N (%) N (%) N (%) N (%)
Age (years)
 Mean (SD) 12.44 (3.05) 12.41 (2.89) 0.88 12.26 (2.99) 12.38 (2.97) 0.74
Sex
 Boy 1855 (52.4) 108 (57.4) 0.17 85 (56.29) 90 (59.60) 0.56
 Girl 1688 (47.6) 80 (42.6)   66 (43.71) 61 (40.40)  
Living area
 Urban 2560 (72.2) 154 (81.9) 0 123 (81.46) 123 (81.46) 1
 Rural 984 (27.8) 34 (18.1)   28 (18.54) 28 (18.54)  
Physical activity
 Low 1116 (33.6) 60 (33.7) 0.08 59 (39.07) 51 (33.77) 0.15
 Moderate 1091 (32.8) 71 (39.9)   44 (29.14) 60 (39.74)  
 High 1116 (33.6) 47 (26.4)   48 (31.79) 40 (26.49)  
SES
 Low 1143 (33.8) 66 (36.7) 0.68 60 (39.74) 57 (37.75) 0.68
 Moderate 1122 (33.1) 59 (32.8)   44 (29.14) 51 (33.77)  
 High 1121 (33.1) 55 (30.6)   47 (31.13) 43 (28.48)  
Watching TV
 Low 1665 (47) 79 (42) 0.18 69 (45.70) 66 (43.71) 0.73
 High 1875 (53) 109 (58)   82 (54.30) 85 (56.29)  
Working with computer
 Low 3161 (91.4) 172 (93) 0.46 138 (91.39) 140 (92.72) 0.67
 High 297 (8.6) 13 (7)   13 (8.61) 11 (7.28)  
Parental BMI
 Mean (SD) 26.32 (4.85) 27.05 (4.99) 0.05 27.09 (4.95) 27.19 (4.88) 0.86*
Sweets
 Daily 720 (20.3) 42 (22.3) 0.19 40 (26.49) 35 (23.18) 0.78
 Weekly 1531 (43.2) 91 (48.4)   66 (43.71) 75 (49.67)  
 Rarely 1195 (33.7) 49 (26.1)   43 (28.48) 39 (25.83)  
 Never 98 (2.8) 6 (3.2)   2 (1.32) 2 (1.32)  
Salty snacks
 Daily 162 (4.6) 19 (10.1) 0.01 11 (7.28) 13 (8.61) 0.8
 Weekly 1000 (28.3) 54 (28.7)   47 (31.13) 43 (28.48)  
 Rarely 1819 (51.5) 89 (47.3)   72 (47.68) 78 (51.66)  
 Never 550 (15.6) 26 (13.8)   21 (13.91) 17 (11.26)  
Soft drinks
 Daily 109 (3.1) 8 (4.3) 0.01 7 (4.64) 6 (3.97) 0.91
 Weekly 927 (26.2) 68 (36.2)   50 (33.11) 46 (30.46)  
 Rarely 1611 (45.5) 73 (38.8)   59 (39.07) 65 (43.05)  
 Never 897 (25.3) 39 (20.7)   35 (23.18) 34 (22.52)  
Diet coke
 Daily 20 (0.6) 1 (0.5) 0.76 0 1 (0.66) 0.58
 Weekly 151 (4.3) 10 (5.4)   7 (4.64) 9 (5.96)  
 Rarely 643 (18.2) 38 (20.4)   25 (16.56) 28 (18.54)  
 Never 2710 (76.9) 137 (73.7)   119 (78.81) 113 (74.83)  
Canned fruit juice
 Daily 363 (10.4) 23 (12.4) 0.8 24 (15.89) 22 (14.57) 0.97
 Weekly 1156 (33.1) 57 (30.8)   53 (35.1) 53 (35.10)  
 Rarely 1501 (42.9) 79 (42.7)   62 (41.06) 62 (41.06)  
 Never 476 (13.6) 26 (14.1)   12 (7.95) 14 (9.27)  
Fast foods
 Daily 418 (11.8) 28 (15) 0.35 17 (11.26) 19 (12.58) 0.98
 Weekly 532 (15) 32 (17.1)   26 (17.22) 26 (17.22)  
 Rarely 1898 (53.6) 97 (51.9)   82 (54.30) 82 (54.30)  
 Never 696 (19.6) 30 (16)   26 (17.22) 24 (15.89)  
Coffee
 Daily 187 (5.3) 18 (9.6) 0.05 8 (5.30) 10 (6.62) 0.59
 Weekly 394 (11.1) 24 (12.8)   22 (14.57) 19 (12.58)  
 Rarely 1386 (39.1) 73 (38.8)   55 (36.42) 65 (43.05)  
 Never 1575 (44.5) 73 (38.8)   66 (43.71) 57 (37.75)  
Family history of hyperlipidemia
 No 1719 (49.1) 92 (49.5) 0.92 77 (50.99) 77 (50.99) 1
 Yes 1783 (50.9) 94 (50.5)   74 (49.01) 74 (49.01)  
Family history of diabetes
 No 1641 (46.6) 77 (41) 0.13 51 (33.77) 60 (39.74) 0.28
 Yes 1877 (53.4) 111 (59)   100 (66.23) 91 (60.26)  
Family history of obesity
 No 1817 (51.5) 91 (48.4) 0.4 72 (47.68) 71 (47.02) 0.91
 Yes 1708 (48.5) 97 (51.6)   79 (52.32) 80 (52.98)  
  1. BMI body mass index, SES socioeconomic status, MetS metabolic syndrome
  2. * P-vale for age according to the T-test, others are based on Chi square test