Table 3 Hazard ratios (HRs) of mortality at one-year follow-up by quintiles of body mass index (BMI) excluding subjects who are totally dependent (total Barthel Index = 0) or have severe dementia (level IV), and those HRs stratified by Barthel index levels (above or below median)
From: Association between body mass index and mortality among institutionalized elderly adults in Japan
Quintiles of BMI (kg/m2) | P for trenda | |||||
|---|---|---|---|---|---|---|
Q1 (<18.3) | Q2 (18.3–20.2) | Q3 (20.3–22.0) | Q4 (22.1–24.4) | Q5 (24.5≤) | ||
All data | ||||||
Number of deaths | 147 | 107 | 79 | 54 | 36 | |
Person-years | 986 | 1,005 | 1,016 | 1,039 | 1,046 | |
Mortality rate (/1000 person-years) | 149.2 | 106.5 | 77.8 | 52.0 | 34.4 | |
Unadjusted HR (95 % CI) | 4.4 (3.0–6.3) | 3.1 (2.1–4.5) | 2.3 (1.5–3.4) | 1.5 (1.0–2.3) | 1 (Ref.) | <0.0001 |
Adjusted HRa (95 % CI) | 2.7 (1.9–4.0) | 2.0 (1.4–2.9) | 1.7 (1.1–2.5) | 1.3 (0.9–2.1) | 1 (Ref.) | <0.0001 |
Q1 (<17.5) | Q2 (17.5–19.3) | Q3 (19.4–21.1) | Q4 (21.2–23.3) | Q5 (23.4≤) | ||
|---|---|---|---|---|---|---|
Barthel index >0, <60 (median) | ||||||
Number of deaths | 106 | 60 | 71 | 49 | 33 | |
Person-years | 462 | 483 | 485 | 491 | 503 | |
Mortality rate (/1000 person-years) | 229.6 | 124.2 | 146.3 | 99.8 | 65.6 | |
Unadjusted HR (95 % CI) | 3.5 (2.4–5.2) | 1.9 (1.2–2.9) | 2.2 (1.5–3.4) | 1.5 (1.0–2.4) | 1 (Ref.) | <0.0001 |
Adjusted HRa (95 % CI) | 3.3 (2.2–4.9) | 1.5 (1.0–2.3) | 2.1 (1.4–3.2) | 1.5 (0.9–2.3) | 1 (Ref.) | <0.0001 |
Q1 (<19.3) | Q2 (19.3–21.1) | Q3 (21.2–23.0) | Q4 (23.1–25.2) | Q5 (25.3≤) | ||
|---|---|---|---|---|---|---|
Barthel index ≥60 (median) | ||||||
Number of deaths | 35 | 22 | 22 | 9 | 16 | |
Person-years | 526 | 529 | 532 | 542 | 538 | |
Mortality rate (/1000 person-years) | 66.6 | 41.6 | 41.4 | 16.6 | 29.7 | |
Unadjusted HR (95 % CI) | 4.0 (1.9–8.4) | 2.5 (1.2–5.5) | 2.5 (1.2–5.4) | 1 (Ref.) | 1.8 (0.8–4.1) | 0.0003 |
Adjusted HRa (95 % CI) | 3.5 (1.7–7.4) | 2.4 (1.1–5.1) | 2.4 (1.1–5.2) | 1 (Ref.) | 2.0 (0.9–4.6) | 0.0037 |