Table 2 Baseline Characteristics of analytic sample by level of social support

 Age

54.8 ± 12.6

54.8 ± 13.2

54.8 ± 12.4

0.87

 Men

1436 (35.8)

307 (36.4)

1129 (35.6)

0.69

 High school education

2567 (63.9)

430 (51)

2137 (67.4)

< 0.01

 Income

< 0.01

   ≤ 1.5 times the poverty level

1297 (32.3)

400 (47.4)

897 (28.3)

   > 1.5 times the poverty level

2130 (53.1)

319 (37.8)

1811 (57.1)

  Missing

588 (14.6)

124 (14.7)

464 (14.6)

 Body Mass Index (n = 4008)

31.8 ± 7.2

32.5 ± 7.6

31.6 ± 7.1

< 0.01

 Smoking status

< 0.01

  Never

2738 (68.2)

518 (61.4)

2220 (70)

  Former or current

1275 (31.8)

325 (38.6)

950 (29.9)

  Missing

2 (0)

0 (0)

2 (0.1)

 Hypertension

0.11

  No HTN

1631 (40.6)

322 (38.2)

1309 (41.3)

  Controlled HTN

1198 (29.8)

254 (30.1)

944 (29.8)

  Uncontrolled HTN

1167 (29.1)

262 (31.1)

905 (28.5)

  Have HTN but can’t determine control^a

16 (0.4)

5 (0.6)

11 (0.3)

  Missing

3 (0.1)

0 (0)

3 (0.1)

 Diabetes

0.03

  No DM

3129 (77.9)

633 (75.1)

2496 (78.7)

  Controlled DM

422 (10.5)

107 (12.7)

315 (9.9)

  Uncontrolled DM

423 (10.5)

98 (11.6)

325 (10.2)

  Missing

41 (1)

5 (0.6)

36 (1.1)

 Annual renal function decline (n = 2947)

1.2 ± 2

1.3 ± 2

1.2 ± 2

0.8

 eGFR at Visit 1 (n = 3953)

94.9 ± 21.5

94.5 ± 24.2

95.1 ± 20.7

0.51

 logACR at Visit 1 (n = 2614)

2.1 ± 1.2

2.2 ± 1.3

2.1 ± 1.2

0.30

 Albuminuria at Visit 1

0.15

  No

2287 (57)

442 (52.4)

1845 (58.2)

  Yes

328 (8.2)

75 (8.9)

253 (8)

  Missing

1400 (34.9)

326 (38.7)

1074 (33.9)

 CKD at Visit 1

0.02

  No

2197 (54.7)

423 (50.2)

1774 (55.9)

  Yes

487 (12.1)

118 (14)

369 (11.6)

  Missing

1331 (33.2)

302 (35.8)

1029 (32.4)

 Functional (ISEL score)

37 ± 7.2

26.1 ± 4.7

39.9 ± 4.4

–

 Structural (Social network size)

5.88 ± 2.67

4.81 ± 2.45

6.17 ± 2.65

< 0.01