Table 4.
Final covariates of excluded and modeled participants
| Characteristics | Participants in the Final Model | Excluded Participants | p-value |
|---|---|---|---|
| N (%) | N (%) | ||
| Total | 14,474 (73) | 5378 (27) | |
| Male | 5944 (41) | 1887 (35) | <.0001 |
| Education | |||
| Less than High School | 1670 (12) | 798 (15) | |
| High School | 3751 (26) | 1525 (28) | <.0001 |
| Some College | 3963 (27) | 1407 (26) | |
| College Diploma | 5090 (35) | 1628 (30) | |
| Income | |||
| Less than $20,000 per year | 3071 (21) | 623 (22) | |
| $20,000 to $35,000 per year | 3991 (28) | 797 (28) | 0.42 |
| $35,000 to $75,000 per year | 4904 (34) | 914 (32) | |
| $75,0000 or more per year | 2508 (17) | 484 (17) | |
| Age | |||
| Less than 55 years | 1885 (13) | 585 (11) | |
| 55 to 59 years | 2583 (18) | 848 (16) | |
| 60 to 64 years | 2759 (19) | 1052 (20) | <.0001 |
| 65 to 69 years | 2654 (18) | 1038 (19) | |
| 70 to 74 years | 2063 (14) | 758 (14) | |
| 75 to 79 years | 1443 (10) | 653 (12) | |
| 80 or more years | 1087 (8) | 436 (8) | |
| Black | 6291 (44) | 2046 (38) | <.0001 |
| Region | |||
| Non Belt/Buckle | 6802 (47) | 2158 (40) | |
| Stroke Belt | 5228 (36) | 2074 (39) | <.0001 |
| Stoke Buckle | 2444 (17) | 1145 (21) | |
| Season | |||
| Summer | 5542 (38) | 2080 (39) | |
| Fall | 2957 (20) | 1116 (21) | 0.76 |
| Winter | 2891 (20) | 1040 (19) | |
| Spring | 3084 (21) | 1142 (21) | |
| Never Used Alcohol | 4291 (30) | 1842 (34) | <.0001 |
| Depressed | 1605 (11) | 653 (13) | 0.0047 |
| PCS-12 (mean, stddev) | 46.2 (10.6) | 45.9 (10.5) | 0.0449 |
stddev = standard deviation; PCS = Physical Components Summary
P-values for categorical variables provided from a chi squared test statistic and for continuous variables provided from a pooled t-test statistic calculated for each variable by inlcusion status.