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. 2012 Sep 24;7(9):e46061. doi: 10.1371/journal.pone.0046061

Table 1. Characteristics of the study population according to institutionalization status.

Variable Total population (n = 1705)a Institutionalized(n = 124, 7.3%) Not institutionalized(n = 1581, 92.7%) P values
Socio-demographic factors
Age, mean (SD) 76.9 (5.5) 81.4 (5.7%) 76.6 (5.3%) <0.001
Currently married 1278 (74.9%) 73 (58.9%) 1205 (76.2%) <0.001
Live alone 318 (18.1%) 44 (35.5%) 274 (17.5%) <0.001
Social support satisfaction, high (DSSS score ≥19) 1294 (76.9%) 69 (57.0%) 1225 (78.5%) <0.001
Social interactions, high (DSSS score ≥9) 1019 (61.2%) 48 (40.3%) 971 (62.8%) <0.001
Country of birth
Australia 849 (49.8%) 82 (66.1%) 767 (48.5%)
ESB immigrant 105 (6.2%) 9 (9.9%) 96 (11.2%)
Non-ESB immigrant 751 (44.1%) 33 (28.7%) 718 (48.4%) 0.0002
Socio-economic factors
Occupation, professional 505 (29.8%) 21 (16.9%) 484 (30.8%) 0.0011
Own house outright 1494 (88.9%) 104 (86.0%) 1390 (89.2%) 0.27
Years of education, ≥7 years 1429 (84.7%) 115 (94.3%) 1314 (83.9%) 0.002
Source of income, pension only 773 (45.9%) 66 (54.1%) 707 (45.3%) 0.06
Health risk factors
Physical activity, normal/high (PASE score ≥80) 1263 (74.9%) 55 (45.5%) 1208 (77.2%) <0.001
Alcohol consumption
Lifelong non-drinker 147 (8.8%) 8 (6.5%) 139 (9.0%)
Ex-drinker 250 (14.9%) 30 (24.4%) 220 (14.2%)
Safe drinker (1–21 drinks per week) 1151 (68.7%) 77 (62.6%) 1074 (69.2%)
Harmful drinker (>21 drinks per week) 127 (7.6%) 8 (6.5%) 119 (7.7%) 0.02
Smoking status
Never smoker 629 (37.3%) 51 (41.8%) 578 (37.0%)
Previous smoker 956 (56.7%) 62 (50.8%) 894 (57.2%)
Current smoker 101 (6.0%) 9 (7.4%) 92 (5.9%) 0.38
Health conditions
Comorbidities, ≥5 237 (14.0%) 30 (24.6%) 207 (13.2%) 0.0005
Urinary incontinence 232 (14.0%) 27 (23.3%) 205 (13.3%) 0.003
Visual acuity, low (<6/19) 74 (4.5%) 15 (12.5%) 59 (3.9%) <0.001
Chronic intrusive pain 223 (13.4%) 24 (20.5%) 199 (12.8%) 0.02
Self-rated health, good or excellent 1176 (69.9%) 68 (57.1%) 1108 (70.9%) 0.002
Shortness of breath 210 (13.3%) 24 (19.4%) 186 (11.8%) 0.013
Hearing loss 1027 (61.1%) 85 (70.3%) 942 (60.4%) 0.03
History of falls 322 (19.1%) 50 (41.7%) 272 (17.4%) <0.001
Depressive symptoms 246 (14.6%) 45 (37.5%) 201 (12.9%) <0.001
Anxiety symptoms 123 (7.4%) 10 (8.7%) 113 (7.3%) 0.57
Cognitive status
Normal 1492 (87.5%) 73 (58.9%) 1419 (89.8%)
Mild cognitive impairment 120 (7.0%) 14 (11.3%) 106 (6.7%)
Dementia 93 (5.5%) 37 (29.8%) 56 (3.5%) <0.001
Physical function and performance
ADL disability (needing help with ≥1 task) 141 (8.3%) 40 (32.3%) 101 (6.4%) <0.001
IADL disability (needing help with ≥1 task) 697 (41.6%) 97 (80.8%) 600 (38.6%) <0.001
Grip strength, poor (lowest quartile and unable) 486 (28.7%) 71 (58.2%) 415 (26.4%) <0.001
Chair stands, slow (lowest quartile and unable) 462 (27.7%) 74 (63.3%) 388 (25.0%) <0.001
Walking speed, slow (lowest quartile and unable) 242 (14.5%) 59 (49.6%) 183 (11.8%) <0.001
Dynamic balance test, poor (lowest quartile and unable) 478 (29.1%) 70 (60.3%) 408 (26.7%) <0.001
Medication use
Polypharmacy (≥5 medicines) 639 (37.7%) 52 (42.3%) 587 (37.3%) 0.27
Psychotropic medications 211 (12.4%) 22 (17.9%) 189 (12.0%) 0.06
Service use
Stay in nursing home in past year 29 (1.7%) 9 (7.4%) 20 (1.3%) <0.001
Use of services in past year 193 (11.3%) 49 (39.5%) 144 (9.1%) <0.001

ADL = Activities of Daily Living [30]; DSSI = Duke Social Support Index [10]; IADL = Instrumental Activities of Daily Living [31]; PASE = Physical Activity Scale for the Elderly [11].

a

Missing data not included in percentages.