Table 1 Characteristics of Yi farmers and migrants, 2007–2015

N

1071 (46.67)

647 (34.16)

< 0.0001

1224 (53.33)

1247 (65.84)

< 0.0001

656 (59.64)

384 (33.05)

< 0.0001

444 (40.36)

778 (66.95)

< 0.0001

Age (years)

38.63 ± 12.39

46.07 ± 13.31

< 0.0001

40.07 ± 11.59

44.99 ± 12.35

< 0.0001

41.48 ± 11.87

52.02 ± 14.30

< 0.0001

39.68 ± 12.42

47.37 ± 14.17

< 0.0001

Age group

< 0.0001

< 0.0001

< 0.0001

< 0.0001

 20–29

287 (26.80)

67 (10.36)

243 (19.85)

115 (9.22)

116 (17.68)

20 (5.21)

100 (22.52)

77 (9.90)

 30–39

292 (27.26)

154 (23.80)

337 (27.53)

330 (26.46)

186 (28.35)

71 (18.49)

136 (30.63)

186 (23.91)

 40–49

258 (24.09)

194 (29.98)

352 (28.76)

409 (32.80)

172 (26.22)

80 (20.83)

112 (25.23)

191 (24.55)

 50–59

180 (16.81)

112 (17.31)

234 (19.12)

212 (17.00)

141 (21.50)

61 (15.89)

59 (13.29)

149 (19.15)

 60–80

54 (5.04)

120 (18.55)

58 (4.74)

181 (14.52)

41 (6.25)

152 (39.58)

37 (8.33)

175 (22.49)

Duration of residence (years)

< 0.0001

0.0165

 1–10

–

–

–

–

146 (22.26)

110 (28.65)

156 (35.13)

276 (35.47)

 11–20

–

–

–

–

192 (29.27)

88 (22.92)

147 (33.11)

233 (29.95)

 21–30

–

–

–

–

170 (25.91)

61 (15.88)

94 (21.17)

138 (17.74)

 31-

–

–

–

–

148 (22.56)

125 (32.55)

47 (10.59)

131 (16.84)

Education ^a

< 0.0001

0.0082

< 0.0001

< 0.0001

 Low

916(87.32)

471(72.80)

1184(98.59)

1208(96.87)

80(12.56)

99(25.78)

204(47.22)

530(68.21)

 Moderate

130(12.39)

163(25.19)

16(1.33)

31(2.49)

269(42.23)

180(46.88)

148(34.26)

182(23.42)

 High

3(0.29)

13(2.01)

1(0.08)

8(0.64)

288(45.21)

105(27.34)

80(18.52)

65(8.37)

Income (CNY) ^a

< 0.0001

< 0.0001

< 0.0001

< 0.0001

 0–1000

856(80.91)

151(23.34)

1091(90.39)

393(31.64)

32(4.92)

9(2.35)

41(9.34)

50(6.47)

 1001–5000

182(17.20)

298(46.06)

111(9.20)

630(50.73)

208(31.95)

30(7.81)

153(34.85)

98(12.68)

 5001-

20(1.89)

198(30.60)

5(0.41)

219(17.63)

411(63.13)

345(89.84)

245(55.81)

625(80.85)

Smoking status ^a

< 0.0001

< 0.0001

< 0.0001

0.1605

 Never smoker

216(20.19)

97(15.02)

1124(91.91)

1171(94.06)

194(29.57)

71(18.49)

415(93.47)

721(92.91)

 Former smoker

21(1.96)

43(6.66)

0(0.00)

12(0.96)

54(8.23)

53(13.80)

4(0.90)

13(1.68)

 0–9 pack-year

275(21.50)

94(14.55)

58(4.74)

25(2.01)

110(16.77)

53(13.80)

14(3.15)

15(1.93)

 10–19 pack-year

239(22.34)

115(17.80)

15(1.23)

15(1.20)

99(15.09)

55(14.32)

7(1.58)

9(1.16)

 20- pack-year

319(29.81)

297(45.98)

26(2.13)

22(1.77)

199(30.34)

152(39.58)

4(0.90)

18(2.32)

Drinking status

< 0.0001

< 0.0001

< 0.0001

0.2917

 Never drinker

497(46.41)

109(16.85)

1132(92.48)

1145(91.82)

172(26.22)

75(19.53)

377(84.91)

663(85.22)

 Ever drinker

26(2.43)

134(20.71)

0(0.00)

20(1.60)

50(7.62)

71(18.49)

7(1.58)

24(3.08)

 Low risk

353(32.96)

264(40.80)

63(5.15)

68(5.45)

308(46.95)

157(40.89)

44(9.91)

74(9.51)

 Moderate risk

40(3.73)

46(7.11)

18(1.47)

5(0.40)

36(5.49)

23(5.99)

7(1.58)

6(0.77)

 High risk

155(14.47)

94(14.53)

11(0.90)

9(0.72)

90(13.72)

58(15.10)

9(2.03)

11(1.41)

Physical activity ^a

< 0.0001

< 0.0001

0.5886

< 0.0001

 Light

18(1.68)

163(25.19)

20(1.64)

353(28.31)

520(79.39)

303(78.91)

287(64.64)

593(76.22)

 Moderate

32(2.99)

50(7.73)

125(10.22)

64(5.13)

94(14.35)

51(13.28)

101(22.75)

124(15.94)

 Heavy

1020(95.33)

434(67.08)

1078(88.14)

830(66.56)

41(6.26)

30(7.81)

56(12.61)

61(7.84)

BMI(kg/m²)^b

20.83 ± 0.08

22.30 ± 0.11

< 0.0001

21.56 ± 0.09

22.42 ± 0.09

< 0.0001

24.00 ± 0.15

24.32 ± 0.20

0.1925

23.46 ± 0.19

24.38 ± 0.14

0.0001