Table 1. Characteristics of octogenarians who underwent ERCP while hospitalized from 2007 to 2010 (n = 61,322).
| Variable | Estimated |
| Sex, female, n (%) | 36,460 (59.5) |
| Age, years, mean (SE) | 84 (0.02) |
| Race, n (%)1 | |
| White | 41,144 (79.9) |
| Hispanic | 4,032 (7.8) |
| African-American | 2,670 (5.2) |
| Other | 3,669 (7.1) |
| More than 2 comorbidities, n (%)2 | 38,940 (63.5) |
| Alcohol abuse, n (%) | 534 (0.9) |
| Study period, n (%) | |
| 2007 | 14,996 (24.5) |
| 2008 | 15,632 (25.5) |
| 2009 | 15,220 (24.8) |
| 2010 | 15,473 (25.2) |
| Hospital region, n (%) | |
| Northeast | 15,567 (25.4) |
| Midwest | 14,539 (23.7) |
| South | 19,140 (31.2) |
| West | 12,076 (19.7) |
| Urban hospital, n (%) | 56,889 (93.1) |
| Hospital teaching, n (%) | 30,188 (49.4) |
| Primary payer, n (%)3 | |
| Medicare | 56,182 (91.7) |
| Medicaid | 973 (1.6) |
| Private insurance | 3,376 (5.5) |
| Self-pay, no charge, other | 759 (1.2) |
| Admission source, n (%) | |
| Routine | 6,814 (26.3) |
| Emergency department | 16,937 (65.5) |
| Other facility4 | 2,123 (8.2) |
| Admission type, n (%) | |
| Emergency | 34,600 (64.5) |
| Urgent | 12,284 (22.9) |
| Elective | 6,700 (12.5) |
| Other | 39 (0.07) |
| Hospital bed size, n (%) | |
| Small | 5,366 (8.8) |
| Medium | 14,331 (23.5) |
| Large | 41,382 (67.8) |
| Length of stay, days, mean (SE) | 7.1 (0.08) |
| In-hospital mortality, n (%) | 1,919 (3.13) |