Table 2 Trends in discrepancies, PTSD data, fitness status and health outcomes by response wave (number of times a person was contacted before response)

Full responders (N)

7,384

1,651

758

441

10,234

Indicators for misclassification

Discrepant 1 (%)

11.8

11.1

13.1

12.3

11.8

0.5

Discrepant 2 (%)

12.8

12.9

15.8

16.3

13.2

0.007

At least 1 health question missing (%)

2.4

4.0

5.6

7.3

3.1

<0.001

Indicators for outcome prevalence

Unfit (%)

22.8

21.8

22.3

21.7

22.4

0.4

PTSD 50+ (%)

3.7

4.7

4.1

3.3

3.9

0.6

Symptoms 18+ (%)

10.8

11.7

11.1

9.8

10.9

0.97