Table 1.

Baseline data for individual-level characteristics

Individual factorsTotal1st Dose (initiation)2nd Dose3rd Dose
Total, N (%)15,0034,066 (27.1%)2,544 (17.0%)1,524 (10.1%)
Mean age (SD)11.7 (1.3)12.4 (1.12)12.5 (1.08)12.6 (1.04)
Sex
 Female7,315 (48.8%)2,207 (54.3%)1,452 (57.1%)895 (58.7%)
 Males7,688 (51.2%)1,859 (45.7%)1,092 (42.9%)629 (41.3%)
Race/ethnicity
 White10,662 (71.1%)2,925 (71.9%)1,867 (73.4%)1,140 (74.8%)
 Black1,046 (7.0%)319 (7.85%)176 (6.92%)93 (6.1%)
 Asian632 (4.2%)199 (4.89%)127 (4.99%)88 (5.77%)
 Hispanic1,427 (9.5%)350 (8.61%)217 (8.53%)120 (7.87%)
 Other/unknowna1,236 (8.2%)273 (6.71%)157 (6.17%)83 (5.45%)
  • aOf the 1,236 patients with other/unknown race, 541 were missing race data.