Table 1.

Cox regression analysis – exposures and outcomes

	Exposure	Outcome
1	KS1 (age 7) and KS2 (age 11)	Depression at age 12–20 Self-harm at age 12–20
2	KS1(age 7), KS2, (age 11) and KS3 (age 14)	Depression at age 14–20 Self-harm at age 14–20
3	KS1 (age 7), KS2 (age 11), KS3 (age 14), KS4 (age 16)	Depression at age 16–20 Self-harm at age 16–20
4	Depression age 12–14 Self-harm age 12–14	KS3/4 KS3/4

KS, key stage.