Adherence to the paediatric immunisation schedule in England.

Our findings confirm previous studies with smaller study populations that also reported high timeliness, up to 95%, of first vaccine doses scheduled in the first year of life, with a decreasing trend for subsequent doses and vaccines given after the age of 1, and proportions between 22% and 87% of children with at least one delayed vaccination compared to 80% in our study [5] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [31] , [32] , [33] , [34] .

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We observed a small trend of second doses given within a few months after the first dose instead of 28 months later.

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