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Table 1 Population characteristics for the four clinical groups

From: Shorter length of hospital stay for hip fracture in those with dementia and without a known diagnosis of osteoporosis in the USA

Characteristic All
N (%)
Clinical groups P *
Dementia Only
N (%)
OP Only
N (%)
Both OP and dementia
N (%)
Neither OP nor dementia
N (%)
Sample size 2175 (100) 279 (13) 774 (36) 247 (11) 875 (40)  
Sex, Female 1679 (77) 176 (63) 708 (91) 224 (90) 571 (65) <.01
Race, White 2006 (92) 240 (86) 731 (94) 227 (91) 808 (92) <.01
Age
 65–84 years 1030 (47) 123 (44) 334 (43) 93 (37) 480 (54) <.01
 85+ years 1145 (53) 156 (56) 440 (56) 154 (62) 395 (45)
 Median (IQR) 85 (79, 90) 86 (80, 90) 86 (80, 90) 87 (83, 91) 83 (77, 89)  
Fracture type       <.01
 Femoral Neck 1114 (51) 161 (57) 362 (46) 113 (45) 478 (54)  
 Intertrochanteric 960 (44) 109 (39) 372 (48) 126 (51) 353 (40)  
 Subtrochanteric 101 (5) < 10 (3) 40 (5) < 10 (3) 44 (5)  
Surgical repair of fracture 1980 (91) 247 (88) 710 (91) 218 (88) 805(92) .12
Comorbidities
 Congestive heart failure 1097 (50) 137 (49) 404 (52) 148 (59) 408 (46) <.01
 Chronic kidney disease 848 (39) 110 (39) 291 (37) 113(45) 334 (38) .13
 Diabetes 931 (43) 120 (43) 308 (39) 105 (42) 398 (45) .14
 Hypertension 2021 (93) 262 (93) 729 (94) 236 (95) 794 (90) .01
 Acute myocardial infarction 205 (9) 19 (6) 66 (8) 23 (9) 97 (11) .12
 Ischemic Heart Disease 1474 (68) 193 (69) 530 (68) 183 (74) 568 (64) .04
 Hyperlipidemia 1767 (81) 232 (83) 656 (84) 198 (80) 681 (77) <.01
 Depression 1154 (53) 190 (68) 391 (50) 180 (72) 393 (44) <.01
 Arthritisa 1612 (74) 193 (69) 625 (80) 214 (86) 580 (66) <.01
  1. Abbreviations: IQR interquartile range, OP osteoporosi
  2. *P values are for Chi-square tests examining the distribution across the four groups, except for age: Kruskal-Wallis was used
  3. aRheumatoid arthritis or osteoarthritis