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Table 3 Baseline characteristics in female study population (N = 6883)

From: Relationship between body mass index and depressive symptoms: the “fat and jolly” hypothesis for the middle-aged and elderly in China

Variables

Under-weight (%)

Normal weight (%)

Over-weight (%)

Obese (%)

χ2

P

Age (years)

 45-49

42 (8.86)

661 (20.50)

542 (24.63)

236 (24.01)

254.403

0.000

 50-54

36 (7.59)

448 (13.89)

372 (16.90)

166 (16.89)

  

 55-59

89 (18.78)

682 (21.15)

435 (19.76)

216 (21.97)

  

 60-64

71 (14.98)

548 (16.99)

390 (17.72)

164 (16.68)

  

 65-69

70 (14.77)

349 (10.82)

220 (10.00)

92 (9.36)

  

  ≥ 70

166 (35.02)

537 (16.65)

242 (11.00)

109 (11.09)

  

Education

 Illiterate

274 (57.81)

1431 (44.37)

824 (37.44)

352 (35.81)

106.379

0.000

 Less than elementary school

190 (40.08)

1577 (48.90)

1172 (53.25)

549 (55.85)

  

 High school

7 (1.48)

154 (4.78)

135 (6.13)

58 (5.90)

  

 Above vocational school

3 (0.63)

63 (1.95)

70 (3.18)

24 (2.44)

  

Marital status

 Single

128 (27.00)

583 (18.08)

275 (12.49)

117 (11.90)

85.360

0.000

 Married

346 (73.00)

2642 (81.92)

1926 (87.51)

866 (88.10)

  

Hukou

 Non-agricultural hukou

46 (9.70)

500 (15.50)

457 (20.76)

222 (22.58)

61.443

0.000

 Agricultural hukou

428 (90.30)

2725 (84.50)

1744 (79.24)

761 (77.42)

  

Current residence

 Rural

364 (76.79)

2111 (65.46)

1269 (57.66)

520 (52.90)

112.514

0.000

 Urban

110 (23.21)

1114 (34.54)

932 (42.34)

463 (47.10)

  

Smoke

 NO

396 (83.54)

2945 (91.32)

2034 (92.41)

915 (93.08)

53.824

0.000

 Former smoke

13 (2.74)

72 (2.23)

52 (2.36)

22 (2.24)

  

 Current smoke

65 (13.71)

208 (6.45)

115 (5.22)

46 (4.68)

  

Drinking

 NO

412 (86.92)

2803 (86.91)

1941 (88.19)

894 (90.95)

15.206

0.019

 Less than once a month

22 (4.64)

174 (5.40)

120 (5.45)

39 (3.97)

  

 More than once a month

40 (8.44)

248 (7.69)

140 (6.36)

50 (5.09)

  

Eating meals

  ≤ 2 meals per day

99 (20.89)

469 (14.54)

257 (11.68)

107 (10.89)

45.651

0.000

 3 meals per day

369 (77.85)

2694 (83.53)

1912 (86.87)

869 (88.40)

  

  ≥ 4 meals per day

6 (1.27)

62 (1.92)

32 (1.45)

7 (0.71)

  

Taking activities

 No

280 (59.07)

1722 (53.40)

1037 (47.11)

419 (42.62)

59.035

0.000

 Yes

194 (40.93)

1503 (46.60)

1164 (52.89)

564 (57.38)

  

Ever been in major accidental injury

 NO

439 (92.62)

2993 (92.81)

2056 (93.41)

924 (94.00)

2.155

0.541

 Yes

35 (7.38)

232 (7.19)

145 (6.59)

59 (6.00)

  

Self-report health status

 Very poor

117 (24.68)

605 (18.76)

376 (17.08)

174 (17.70)

37.831

0.000

 Poor

208 (43.88)

1197 (37.12)

831 (37.76)

380 (38.66)

  

 Fair

103 (21.73)

996 (30.88)

696 (31.62)

305 (31.03)

  

 Good

36 (7.59)

337 (10.45)

245 (11.13)

104 (10.58)

  

 Very good

10 (2.11)

90 (2.79)

53 (2.41)

20 (2.03)

  

Having regular physical exercises

 No physical exercise

326 (68.78)

1931 (59.88)

1350 (61.34)

623 (63.38)

26.666

0.000

 Less than regular physical exercises

82 (17.30)

676 (20.96)

390 (17.72)

170 (17.29)

  

 Regular physical exercises

66 (13.92)

618 (19.16)

461 (20.95)

190 (19.33)

  

CESD

 CES-D < 10

202 (42.62)

1717 (53.24)

1299 (59.02)

616 (62.67)

69.944

0.000

 CES-D ≥ 10

272 (57.38)

1508 (46.76)

902 (40.98)

367 (37.33)

  
  1. CESD: Center for Epidemiologic Studies- depressive symptoms scale
  2. BMI body mass index, BMI Categories include Underweight (–18.5 kg/m2)/Normal weight (18.5–24 kg/m2)/Overweight (24–28 kg/m2)/Obesity (28– kg/m2)
  3. Hukou: it is an important part of household registration in china and is strictly enforced.Non-agricultural hukou people primarily live in the city and work in factories, public institutions and other workplaces. They have no farm land but have the convenience of city life. Agricultural hukou people primarily live in villages and depend on agriculture and farming for their livelihood