Table 1 Baseline characteristics of the original cohort
| Â | Overall | Readmitted | Not readmitted |
|---|---|---|---|
Characteristics | n = 905 | n = 167 | n = 738 |
Age (year) median (interquartile range) | 76 (68–82) | 74 (68–82) | 76 (68–82) |
Sex | |||
 Male | 415 (46%) | 71 (43%) | 344 (46%) |
 Female | 490 (54%) | 96 (57%) | 394 (53%) |
Non-Hispanic white race | 770 (85%) | 152 (20%) | 618 (84%) |
Smoking status | |||
 Current smoker | 194 (21%) | 31 (16%) | 163 (22%) |
 Former smoker | 524 (58%) | 89 (17%) | 435 (59%) |
 Never smoker | 187 (21%) | 47 (25%) | 140 (19%) |
Comorbidities* | |||
 Cardiac diseases | 561 (62%) | 115 (21%) | 446 (60%) |
 Central nervous system diseases | 50 (6%) | 11 (22%) | 39 (5%) |
 Endocrine diseases | 293 (32%) | 45 (15%) | 248 (34%) |
 Gastrointestinal diseases | 246 (27%) | 46 (19%) | 200 (27%) |
 Hematologic diseases | 130 (14%) | 22 (17%) | 108 (15%) |
 Musculoskeletal diseases | 36 (4%) | 10 (28%) | 26 (4%) |
 Neoplasms | 34 (4%) | 3 (9%) | 31 (4%) |
 Psychiatric diseases | 270 (30%) | 50 (19%) | 220 (30%) |
 Respiratory diseases | 275 (30%) | 45 (16%) | 230 (31%) |
 Other diseases | 52 (6%) | 10 (19%) | 42 (6%) |
Mechanical ventilation use during the index hospitalization | 56 (6%) | 13 (23%) | 43 (6%) |
Socioeconomic factors | |||
 Educational level | |||
  8th grade or less | 157 (17%) | 36 (23%) | 121 (16%) |
  Some high school education | 232 (26%) | 46 (20%) | 186 (25%) |
  High school graduate | 491 (54%) | 79 (16%) | 412 (56%) |
  Not responded | 25 (3%) | 6 (24%) | 19 (3%) |
Marital status (currently married) | 313 (35%) | 52 (17%) | 261 (35%) |
Number of children | |||
 0 | 99 (11%) | 22 (22%) | 77 (10%) |
 1 | 317 (35%) | 23 (17%) | 294 (40%) |
 ≥ 2 | 489 (54%) | 122 (18%) | 367 (50%) |
Limitations on activities and social life | 584 (65%) | 108 (19%) | 476 (64%) |
Poverty (annual household income <$25,000) | 531 (59%) | 103 (19%) | 428 (58%) |
Living in metropolitan area | 564 (62%) | 97 (17%) | 467 (63%) |