Table 1.

American Academy of Pediatrics (AAP) well baby visit periodicity schedule from 2000 and operationalization of study outcome measure (total number of well baby visits received by age three years)

2000 AAP well baby visit periodicity schedule	Age ranges*
1 month	7 days to <1 month
2 month	1 month to <3 months
4 month	3 months to <5 months
6 month	5 months to <8 months
9 month	8 months to <11months
12 month	11 months to <14months
15 month	14 months to <17 months
18 month	17 months to <20 months
24 month	20 months to <30 months
36 month	30 months to 41 months

*Byrd et al. 1999 [9].