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

From: Increasing prevalence of overweight and obesity in Yi farmers and migrants from 2007 to 2015 in China: the Yi migrant study

  Yi Farmer Yi Migrant
Male Female Male Female
2007 2015 P 2007 2015 P 2007 2015 P 2007 2015 P
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
  1. Data are presented as mean ± standard deviation or number (percentage);
  2. a: Numbers do not sum up to the total due to missing data;
  3. b: Lsmeans ± standard error, adjust for age;
  4. Abbreviation: BMI body mass index