Table 2.

Results from the self-controlled case series analyses

Risk period	No. of events	IRR (95% confidence interval)	pvalue
Total
Unexposed	1,911	1
Pre exposed: 90 d	134	12.12 (10.06−14.61)	< 0.001
Exposed	3,902	18.06 (16.67−19.56)	< 0.001
After exposed: 30 d	48	2.56 (1.92−3.42)	< 0.001
After exposed: 31−60 d	20	1.12 (0.72−1.74)	0.618
After exposed: 61−90 d	30	1.75 (1.21−2.51)	0.003
Age		1.58 (1.56−1.61)	< 0.001
Age 6 to 9 years
Unexposed	529	1
Pre exposed: 90 d	48	13.11 (9.58−17.95)	< 0.001
Exposed	2,044	17.7 (15.6−20.08)	< 0.001
After exposed: 30 d	14	1.68 (0.98−2.86)	0.058
After exposed: 31−60 d	7	0.92 (0.44−1.94)	0.826
After exposed: 61−90 d	10	1.42 (0.75−2.65)	0.279
Age		1.54 (1.51−1.58)	< 0.001