Table 1. Baseline Characteristics of CD Patients With and Without IDA.
| IDA absent (n = 62,586) | IDA present (n = 5,495) | P value | |
|---|---|---|---|
| Median age (IQR) | 54 (37 - 68) | 47 (32 - 65) | < 0.001a |
| Sex (%) | |||
| Male | 26,561 (42.4) | 2,087 (38) | < 0.001b |
| Female | 36,025 (57.6) | 3,408 (62) | |
| Bed size of the hospital (%) | |||
| Small | 10,698 (17.1) | 913 (16.6) | 0.211b |
| Medium | 17,124 (27.4) | 1,462 (26.6) | |
| Large | 34,764 (55.5) | 3,120 (56.8) | |
| Insurance (%) | |||
| Medicare | 25,509 (40.8) | 1,966 (35.8) | < 0.001b |
| Medicaid | 8,690 (13.9) | 986 (17.9) | |
| Private insurance | 24,034 (38.4) | 2,156 (39.2) | |
| Self-pay | 2,326 (3.7) | 218 (4) | |
| No charge | 1,693 (2.7) | 139 (2.5) | |
| Other | 334 (0.5) | 30 (0.5) | |
| Median household income quartile for patient ZIP code (%) | |||
| 0 - 25th percentile | 14,252 (22.8) | 1,331 (24.2) | 0.011b |
| 26th -50th percentile | 17,066 (27.3) | 1,480 (26.9) | |
| 51st - 75th percentile | 16,678 (26.6) | 1,493 (27.2) | |
| 76th - 100th percentile | 14,590 (23.3) | 1,191 (21.7) | |
| Hospital teaching status of urban hospitals (%) | |||
| Non-metropolitan hospital | 4,113 (6.6) | 272 (4.9) | < 0.001b |
| Metropolitan non-teaching | 13,137 (21) | 1,027 (18.7) | |
| Metropolitan teaching | 45,336 (72.4) | 4,196 (76.4) |
aMann-Whitney test. bPearson Chi-square test. IDA: iron deficiency anemia; CD: Crohn’s disease; IQR: interquartile range.