Table 1 Description of independent variables in 2011

 Male^a

5757(47.31)

2272(47.42)

3485(47.24)

 Female

Male = 0, female = 1

6411(52.69)

2519(52.58)

3892(52.76)

 18–44^a

4346(35.72)

1658(34.61)

2688(36.44)

 45–59

45–59 = 1, else = 0

4038(33.19)

1566(32.69)

2472(33.51)

  > 60

60 and above = 1, else = 0

3784(31.10)

1567(32.71)

2217(30.05)

 Underweight^a

BMI < 18.5 kg/m²

621(5.18)

222(4.69)

399(5.49)

 Normal weight

18.5 ≤ BMI < 25.0 kg/m² = 1, else = 0

5864(48.88)

2272(48.04)

3592(49.42)

 Overweight

25.0 ≤ BMI < 30.0 kg/m² = 1, else = 0

3756(31.31)

1529(32.33)

2227(30.64)

 Obese

BMI ≥ 30.0 kg/m² = 1, else = 0

1756(14.64)

706(14.93)

1050(14.45)

 No^a

11,673(95.93)

4496(96.84)

7177(97.27)

 Yes

Have been diagnosed with diabetes by a doctor =1, else = 0

482(3.96)

285(5.95)

197(2.67)

 Illiterate or Primary^a

4338(35.70)

1063(22.23)

3275(44.44)

 Secondary

Secondary =1, else = 0

6326(52.07)

2699(56.45)

3627(49.22)

 College or above

College degree or above =1, else = 0

1486(12.23)

1019(21.31)

467(6.34)

 Single^a

641(5.36)

339(7.21)

302(4.16)

 Marriage

Marriage =1, else = 0

10,108(84.53)

3876(82.42)

6232(85.90)

 Others

Others =1, else = 0

1209(10.11)

488(10.38)

721(9.94)

 No^a

Never smoke

8463(69.55)

3386(70.67)

5077(68.82)

 Yes

Smoke = 1, else = 0

3701(30.42)

1403(29.28)

2298(31.15)

 No^a

Never drink

8048(66.14)

3011(62.85)

5037(68.28)

 Yes

Drink beer or alcohol last year = 1, else = 0

4118(33.84)

1778(37.11)

2340(31.72)

 East of China^a

Living in the east of China

5188(42.64)

2359(49.24)

2829(38.35)

 Middle of China

Living in the middle of China = 1, else = 0

5058(41.57)

1644(34.31)

3414(46.28)

 West of China

Living in the west of China = 1, else = 0

1922(15.80)

788(16.45)

1134(15.37)

 No^a

Absence basic health insurance

414(3.40)

205(4.28)

209(2.83)

 Yes

Having basic health insurance = 1, else = 0

11,751(96.60)

4583(95.72)

7168(97.17)

 No^a

901(7.40)

448(9.35)

453(6.14)

 Yes

Receiving preventative health service in the last four weeks = 1, else = 0

11,255(92.50)

4339(90.57)

6916(93.75)

 Quintile1 (poorest^a)

20% low income individuals

2429(19.96)

957(19.97)

1474(20.01)

 Quintile2 (poorer)

20% lower income individuals = 1, else = 0

2431(19.98)

954(19.91)

1477(20.05)

 Quintile3 (middle)

20% middle-income individuals = 1, else = 0

2424(19.92)

955(19.93)

1470(19.96)

 Quintile4 (richer)

20% higher income individuals = 1, else = 0

2429(19.96)

954(19.91)

1473(20.00)

 Quintile5 (richest)

20% high income individuals = 1, else = 0

2426(19.94)

953(19.89)

1472(19.98)

12,168

4791

7377