Table 2.
Cohort characteristics
| Variable | Person-Years | Percent |
|---|---|---|
| Age group | ||
| 19–49 years | 35,360,219.65 | 61.92 |
| 50–64 years | 21,748,096.07 | 38.08 |
| Gender | ||
| Female | 27,290,491.17 | 47.79 |
| Male | 29,817,824.55 | 52.21 |
| Health plan type | ||
| Fee-for-service | 1,159,288.49 | 2.03 |
| PPO/EPO | 36,123,603.49 | 63.25 |
| HMO | 6,943,639.48 | 12.16 |
| POS | 4,046,790.82 | 7.09 |
| HDHP/CDHP | 6,592,500.88 | 11.54 |
| Unknown | 2,242,492.56 | 3.93 |
| Medical conditions | ||
| Healthy | 47,370,548.67 | 82.95 |
| With at-risk or high-risk conditions | 9,737,767.05 | 17.05 |
| At-risk conditions | ||
| Overall | 7,119,125.33 | 100.0 |
| Asthma | 1,596,160.50 | 22.42 |
| Chronic heart disease | 1,432,517.29 | 20.12 |
| Chronic lung disease | 1,007,145.18 | 14.15 |
| Chronic liver disease | 607,949.48 | 8.54 |
| Diabetes mellitus | 3,656,304.75 | 51.36 |
| Number of at-risk conditions | ||
| 1 | 6,089,016.03 | 85.53 |
| ≥ 2 | 1,030,109.30 | 14.48 |
| High-risk conditions | ||
| Overall | 2,618,641.72 | 100.0 |
| Chronic renal disease | 424,677.27 | 16.22 |
| Cancer | 1,825,298.26 | 69.70 |
| Asplenia | 40,691.59 | 1.55 |
| HIV | 108,115.60 | 4.13 |
| Organ transplant | 522,834.47 | 19.97 |
| Number of high-risk conditions | ||
| 1 | 2,325,408.37 | 88.80 |
| ≥ 2 | 293,233.35 | 11.19 |
| Number of years in follow-up period | ||
| Mean (SD) | 0.93 (0.20) | |
HDHP/CDHP High Deductible/Consumer Driven Health Plan, HIV human immunodeficiency virus, HMO Health Maintenance Organization, POS Point of Service, PPO/EPO Preferred/Exclusive Provider Organization, SD standard deviation