Table 2.

Nested case-control analysis exposures and covariates.

	Cases (n = 42)	Controls (n = 210)
Received any rotavirus vaccine, no. (column %)	34 (81%)	189 (90%)
Received 1 dose rotavirus vaccine, no. (column %)	2 (5%)	6 (3%)
Received 2 doses rotavirus vaccine, no. (column %)	11 (26%)	57 (27%)
Received ≥ 3 doses rotavirus vaccine, no. (column %)	21 (50%)	126 (60%)
Number of health care visits in first year of life, mean (SD)*	23.2 (32.5)	12.6 (13.3)
Number of total vaccines received prior to reference date – any type, mean (SD)	22.2 (6.1)	22.3 (6.0)

^*Number of days with a healthcare encounter in the first year of life; each day of a hospitalization included in total.