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Table 1 Characteristics of study population for the full (n=890,394) and sampled cohorts

From: Fitting parametric random effects models in very large data sets with application to VHA national data

Analysis variable

Full cohort (n=890,394)

25% (n=225,000)

10% (n=90,000)

5% (n=45,000)

1% (n=9,000)

REMR (n=890,394)

Non-Hispanic White: % (n)

62

(547,645)

61

(138,470)

62

(55,489)

62

(27,853)

62

(5,529)

62

(547,645)

Non-Hispanic Black: % (n)

12

(107,935)

12

(27,317)

12

(10,941)

12

(5,406)

12

(1,097)

12

(107,935)

Hispanic: % (n)

14

(123,558)

14

(31,062)

14

(12,481)

14

(6,148)

14

(1,285)

13

(123,558)

Other: % (n)

12

(111,256)

13

(28,151)

12

(11,089)

12

(5,593)

12

(1,089)

13

(111,256)

Male: % (n)

98

(869,508)

98

(219,708)

98

(87,921)

98

(43,947)

98

(8,794)

98

(869,508)

Married: % (n)

65

(574,307)

64

(145,060)

65

(58,222)

64

(29,002)

65

(5,853)

64

(574,307)

Disability (mean % & sd)

12

(0.03)

12

(0.06)

12

(0.09)

12

(0.13)

13

(0.30)

12

(0.63)

Northeast

12

(103,056)

12

(25,994)

11

(10,274)

12

(5,272)

12

(1,074)

-

(103,056)

Mid-Atlantic

23

(201,058)

22

(50,579)

23

(20,328)

23

(10,230)

23

(2,000)

-

(201,058)

Midwest

21

(184,348)

21

(46,940)

21

(18,658)

21

(9,368)

20

(1,827)

-

(184,348)

South

30

(265,450)

30

(66,988)

30

(26,759)

29

(13,189)

30

(2,707)

-

(265,450)

West

15

(136,482)

15

(34,499)

16

(13,981)

15

(6,941)

16

(1,392)

-

(136,482)

Urban Residence

62

(548,786)

61

(138,339)

61

(55,324)

62

(27,701)

61

(5,513)

61

(548,786)

Rural Residence

38

(341,608)

39

(85,612)

39

(34,676)

38

(17,299)

39

(3,487)

39

(341,608)

Mean HbA1c (mean % & sd)

7.4

(0.002)

7.4

(0.003)

7.4

(0.005)

7.4

(0.007)

7.4

(0.016)

7.5

(0.030)

Mean HbA1c<8%: % (n)

73

(703,596)

73

(177,751)

73

(71,195)

73

(34,498)

71

(7,112)

70

(703,596)

No Comorbidities

57

(507,320)

57

(128,326)

57

(51,178)

57

(25,506)

57

(5,143)

57

(507,320)

1 Comorbidity

28

(248,898)

28

(62,961)

28

(25,309)

28

(12,655)

27

(2,456)

28

(248,898)

2 Comorbidities

11

(95,542)

11

(23,998)

11

(9,706)

11

(4,898)

11

(1,022)

11

(95,542)

3+ Comorbidities

4

(38,634)

4

(9,715)

4

(3,807)

4

(1,941)

4

(379)

4

(38,634)

  1. Not applicable due to sampling by VISN or aggregation by VISN.