Table 1 Baseline characteristics of the study population

Age (y)

32.34 ± 5.19

31.87 ± 5.19

32.64 ± 5.19

33.82 ± 5.19

 < 0.001

Male (%)

11,923(74.76)

4541(58.91)

6406(88.49)

976(97.50)

 < 0.001

Education level (%)

 Illiteracy or primary school

148(0.93)

34(0.44)

78(1.08)

36(3.60)

 < 0.001

 Junior high school

8279(51.91)

3567(46.28)

4109(56.76)

603(60.24)

 < 0.001

 Senior high school and above

7521(47.16)

4107(53.28)

3052(42.16)

721(72.03)

 < 0.001

Income level, ¥/month (%)

 ≤ 800

12,827(80.43)

6040(78.36)

5952(82.22)

835(83.42)

 < 0.001

 800–1000

1574(9.87)

753(9.77)

718(9.92)

103(10.29)

 < 0.001

 ≥ 1000

1547(9.70)

915(11.87)

569(7.86)

63(6.29)

 < 0.001

Alcohol consumption (%)

 Never

8168(51.22)

4807(62.36)

3106(42.91)

255(25.47)

 < 0.001

 Current drinker

7496(47.00)

2788(36.17)

3987(55.08)

25(2.50)

 < 0.001

 Past

284(1.78)

113(1.46)

146(2.01)

721(72.03)

 < 0.001

Married individuals (%)

14,477(90.78)

6856(88.95)

6668(92.11)

953(95.20)

 < 0.001

Family history of CVD (%)

816(5.12)

337(4.37)

388(5.36)

91(9.09)

 < 0.001

Health factors under controlled (%)

 Blood glucose

15,540(97.44)

7697(99.86)

7003(96.74)

840(83.92)

 < 0.001

 Blood pressure

12,800(80.26)

7589(98.46)

4906(67.77)

305(30.47)

 < 0.001

 Blood lipids

13,459(84.39)

7522(97.59)

5546(76.61)

391(39.06)

 < 0.001

 Body mass index

14,557(91.28)

7632(99.01)

6348(87.69)

577(57.64)

 < 0.001

Health behaviours under controlled (%)

 Diet health

4582(28.73)

3063(39.74)

1372(18.95)

147(14.69)

 < 0.001

 Nicotine exposure

10,051(63.02)

6604(85.68)

3251(44.91)

196(19.58)

 < 0.001

 Physical activity

14,134(88.63)

7566(98.16)

6035(83.37)

533(53.25)

 < 0.001

 Sleep health

15,134(94.90)

7635(99.05)

6740(93.11)

759(75.82)

 < 0.001