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Table 1 Comparison of demographic and clinical characteristics among participants with different levels of eGFR at baseline

From: Association between pulse pressure, systolic blood pressure and the risk of rapid decline of kidney function among general population without hypertension: results from the China health and retirement longitudinal study (CHARLS)

Characteristics

Overall

eGFR (ml/min/1.73m2)

P value

 ≥ 90

60–89

 < 60

In Total (n, %)

4534(100.0)

3140(69.2)

1313(39.0)

81(1.8)

 

Age (years, mean ± SD)

57.8 ± 8.4

55.9 ± 7.5

61.7 ± 8.6

68.9 ± 8.4

 < 0.001

Gender (n, %)

    

0.530

 Male

2092(46.1)

1439(45.8)

611(46.5)

42(51.9)

 

 Female

2442(53.9)

1701(51.2)

702(53.5)

39(48.1)

 

Smoke (n, %)

    

0.019

 Never

2805(62.1)

1966(62.7)

792(60.7)

47(58.8)

 

 Past

387(8.6)

240(7.7)

136(10.4)

11(13.8)

 

 Current

1326(29.4)

928(29.6)

376(28.8)

22(27.5)

 

Drink (n, %)

    

0.002

 Never

2669(58.9)

1837(58.6)

777(59.2)

55(67.9)

 

 Past

349(7.7)

215(6.9)

126(9.6)

8(9.9)

 

 Current

1512(33.4)

1084(34.6)

410(31.2)

18(22.2)

 

BMI (kg/m2, mean ± SD)

23.3 ± 3.7

23.3 ± 3.7

23.3 ± 3.8

22.5 ± 4.4

0.170

Diabetes (n, %)

    

0.003

 No

3521(86.3)

2464(86.9)

1006(85.7)

51(72.9)

 

 Yes

559(13.7)

372(13.1)

168(14.3)

19(27.1)

 

HbA1c (%, mean ± SD)

5.25 ± 0.77

5.25 ± 0.79

5.24 ± 0.72

5.37 ± 0.90

0.311

LDL (mg/dl, mean ± SD)

115.4 ± 33.7

113.5 ± 32.7

120.0 ± 35.8

113.6 ± 34.7

 < 0.001

UA (mg/dl, mean ± SD)

4.3 ± 1.2

4.1 ± 1.1

4.8 ± 1.2

5.9 ± 1.6

 < 0.001

PP (mmHg, mean ± SD)

48.1 ± 8.8

47.5 ± 8.6

49.3 ± 9.2

51.6 ± 10.2

 < 0.001

PP category (n, %)

    

 < 0.001

 Normal: < 60 mmHg

4057(89.5)

2869(91.4)

1124(85.6)

64(79.0)

 

 High: ≥ 60 mmHg

477(10.5)

271(8.6)

189(14.4)

17(21.0)

 

SBP (mmHg, mean ± SD)

118.6 ± 11.8

118.0 ± 11.6

119.7 ± 12.1

122.3 ± 11.2

 < 0.001

SBP category (n, %)

    

 < 0.001

 Low: < 120 mmHg

2398(52.9)

1728(55.0)

644(49.1)

26(32.1)

 

 Medium: 120–129 mmHg

1187(26.2)

827(26.3)

327(24.9)

33(40.7)

 

 High: 130–139 mmHg

949(20.9)

585(18.6)

342(26.1)

22(27.2)

 

DBP (mmHg, mean ± SD)

70.5 ± 8.9

70.5 ± 8.9

70.5 ± 9.1

70.7 ± 8.9

0.950

DBP category (n, %)

    

0.836

 Low: < 60 mmHg

531(11.7)

364(11.6)

160(12.2)

7(8.6)

 

 Medium: 60–74 mmHg

2502(55.2)

1733(55.2)

725(55.2)

44(54.3)

 

 High: 75–89 mmHg

1501(33.1)

1043(33.2)

428(32.6)

30(37.0)

 
  1. eGFR estimated glomerular filtration, SD standard deviation, IQR interquartile range, BMI body mass index, HbA1c hemoglobin A1c, LDL low-density lipoprotein, UA uric acid, PP pulse pressure, SBP systolic pressure, DBP diastolic pressure