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Table 1 Baseline characteristics of each female cohort

From: Impact of sample size on the stability of risk scores from clinical prediction models: a case study in cardiovascular disease

  

Development

(n = 1,865,079)

Validation

(n = 100,000)

Contemporary

(n = 387,557)

Outcome

Total CVD events

82 065

4482

NA

 

Total follow-up (years)

13 098 449

703 471

NA

Age

 

43.07 (15.94)

43.14 (15.96)

48.38 (14.43)

Systolic blood pressure

 

123.91 (18.28)

124 (18.22)

123.97 (15.17)

Body mass index

 

25.6 (5.60)

25.56 (5.56)

27.1 (6.31)

Cholesterol/high-density lipoprotein ratio

 

3.72 (1.20)

3.72 (1.21)

3.46 (1.04)

Smoking status

Never

56.04%

56.15%

46.05%

 

Ex

16.97%

16.98%

31.66%

 

Current

27.00%

26.87%

22.29%

Townsend

1 (least deprived)

21.96%

21.96%

24.95%

 

2

21.99%

21.81%

22.35%

 

3

21.17%

21.46%

21.56%

 

4

20.46%

20.36%

18.70%

 

5 (most deprived)

14.42%

14.41%

12.44%

Treated hypertension

 

6.18%

6.19%

8.45%

Family history of CVD

 

15.08%

15.13%

20.86%

Type 2 diabetes

 

1.16%

1.19%

1.15%

  1. For continuous variables, the mean (standard deviation) is reported. There is no follow-up reported (NA) for the contemporary cohort because individuals entered the cohort on 1 Jan 2016, and follow-up in the CPRD extract stopped 3 months after this