Demographics of Study Participants by Study Arm at Baseline
| Characteristics | Intervention Arm (n=2,364) No. (%) | Control Arm (n=1,422) No. (%) |
|---|---|---|
| Note: After adjusting for practice clustering and site differences, the only statistically significant difference between the study arms exists for starting season (P=.003). | ||
| a Income for 12% was not reported in either group. | ||
| Sex, female | 1,676 (71) | 962 (68) |
| Age, mean (SD), y | 50.3 (8.4) | 51.1 (8.0) |
| Hispanic or Latino | 58 (2) | 29 (2) |
| Race | ||
| White | 2,134 (90) | 1,320 (93) |
| Black or African American | 87 (4) | 35 (3) |
| Asian | 70 (3) | 31 (2) |
| Other | 42 (2) | 20 (1) |
| More than 1 race | 31 (1) | 16 (1) |
| Marital status | ||
| Single, never married | 203 (9) | 96 (7) |
| Married or living with partner | 1,857 (79) | 1,135 (80) |
| Separated or divorced | 260 (11) | 160 (12) |
| Widowed | 44 (2) | 31 (2) |
| Season study started | ||
| January–April | 1,179 (50) | 411 (29) |
| May–August | 704 (30) | 375 (26) |
| September–December | 481 (20) | 636 (45) |
| Annual household incomea | ||
| Less than $25,000 | 91 (4) | 41 (3) |
| $25,001 to $35,000 | 102 (5) | 45 (4) |
| $35,001 to $50,000 | 218 (11) | 106 (8) |
| $50,001 to $75,000 | 402 (19) | 228 (18) |
| More than $75,000 | 1,262 (61) | 834 (66) |
| Currently has health insurance | 2,276 (96) | 1,380 (97) |