Table 4.

Sex-adjusted odds ratios (95% confidence intervals) for immune thrombocytopenic purpura occurrence in simultaneous administration of vaccines among children aged < 12 years

Age group (years)	Single vaccination	All simultaneous vaccinations	Simultaneous live vaccinations†	Simultaneous inactivated vaccinations	Simultaneous live and inactivated vaccinations‡
< 12	1.38 (0.57–3.33)	1.52 (0.45–5.21)	Unable to estimate	1.83 (0.44–7.59)	1.36 (0.29–6.30)
< 2	1.21 (0.34–4.34)	1.95 (0.44–8.72)	Unable to estimate	1.41 (0.29–6.94)	2.85 (0.43–18.9)

^†Odds ratios for simultaneous live vaccinations could not be estimated because of small sample sizes

^‡Simultaneous administration of live and inactivated vaccines