TABLE 3.
Comparison of select baseline variables between African-American patients and non-African-American patients in the original (unmatched) and the matched interstitial lung disease (ILD) datasets
| Original (unmatched) data | p-value | Matched data | Standardised difference# | p-value | |||
|---|---|---|---|---|---|---|---|
| African-American patients | Non-African-American patients | African-American patients | Non-African-American patients | ||||
| Patients n | 222 | 1418 | 180 | 126 | |||
| Age years | 57.5±13.2 | 67.8±11.9 | <0.001 | 56.6±12.6 | 57.8±13.1 | 0.087 | 0.408 |
| Male | 56 (25.2) | 765 (54.0) | <0.001 | 44 (24.4) | 37 (29.4) | 0.052 | 0.337 |
| BMI kg-m−2 | 30.5±7.5 | 29.2±6.4 | 0.014 | 30.4±7.5 | 30.4±6.2 | 0.005 | 0.961 |
| Ever-smoker | 97 (43.7) | 634 (44.7) | 0.777 | 86 (47.9) | 57 (45.2) | 0.033 | 0.661 |
| Disease severity index | |||||||
| GAP-ILD score¶ | 4.2±1.7 | 4.2±1.7 | 0.802 | 4.3±1.7 | 4.2±1.8 | 0.023 | 0.683 |
| Socioeconomic factors | |||||||
| Out-of-state referral | 23 (10.4) | 221 (15.6) | 0.042 | 22 (12.2) | 15 (11.9) | <0.001 | 0.933 |
| Income level below national median | 161 (72.9) | 501 (35.5) | <0.001 | 134 (74.4) | 87 (69.1) | 0.039 | 0.300 |
| Medicare with private insurance | 99 (45.6) | 462 (33.3) | <0.001 | 82 (45.6) | 57 (45.2) | 0.022 | 0.956 |
| Tertiary hospital centre | 195 (87.8) | 957(67.5) | <0.001 | 156 (86.7) | 106 (84.1) | 0.068 | 0.533 |
| Immunosuppressive therapy | 120 (55.8) | 651 (47.3) | 0.020 | 115 (63.9) | 80 (63.5) | 0.070 | 0.943 |
Data are presented as mean±SD or n (%), unless otherwise stated. BMI: body mass index; GAP: gender–age–physiology.
#:
comparing the frequency in the matched cohort to the unmatched cohort;
¶:
forced vital capacity, diffusing capacity of the lungs for carbon monoxide, ILD subtype.