Table 3.
Coefficients (95% confidence interval) by baseline BMI for change in quality-of-life measures, 1996–2000, associated with a quartile of change in physical activity, 1986 to 1996, Nurses Health Study a
| Normal (BMI<25) | Pre-obese (25≤BMI<30) | Class I Obese (30≤BMI<35) | Class II Obese (BMI≥35) | |
|---|---|---|---|---|
| n=36291 | n=16633 | n=5490 | n=2389 | |
|
Physical functioning
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | −0.37 (−0.90, 0.16) | −0.83 (−1.69, 0.03) | −0.10 (−1.66, 1.46) | −0.81 (−3.35, 1.73) |
| Some increase in physical activity | 0.93 (0.42, 1.44) | 0.90 (0.10, 1.70) | 0.25 (−1.19, 1.69) | 1.85 (−0.43, 4.13) |
| Increase in physical activity | 1.90 (1.43, 2.37) | 1.54 (0.76, 2.32) | 1.67 (0.23, 3.11) | 2.32 (−0.08, 4.72) |
|
Role limitations due to emotional problems
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | 0.35 (−0.45, 1.15) | −0.27 (−1.54, 1.00) | −0.90 (−3.36, 1.56) | −2.79 (−6.61, 1.03) |
| Some increase in physical activity | 0.92 (0.16, 1.68) | 1.29 (0.10, 2.48) | −0.19 (−2.37, 1.99) | −0.61 (−4.00, 2.78) |
| Increase in physical activity | 1.29 (0.59, 1.99) | 0.61 (−0.54, 1.76) | 0.98 (−1.20, 3.16) | 1.70 (−1.83, 5.23) |
|
Role limitations due to physical problems
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | 0.53 (−0.50, 1.56) | −0.63 (−2.27, 1.01) | −2.62 (−5.60, 0.36) | −2.23 (−6.95, 2.49) |
| Some increase in physical activity | 0.93 (−0.06, 1.93) | 0.18 (−1.38, 1.74) | 0.33 (−2.42, 3.08) | 0.40 (−3.83, 4.63) |
| Increase in physical activity | 1.97 (1.05, 2.89) | 2.00 (0.50, 3.50) | 1.27 (−1.50, 4.04) | 3.06 (−1.33, 7.45) |
|
Bodily pain
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | 0.64 (0.09, 1.19) | 0.07 (−0.77, 0.91) | −1.95 (−3.45, −0.45) | −3.17 (−5.55, −0.79) |
| Some increase in physical activity | 0.66 (0.13, 1.19) | 0.34 (−0.46, 1.14) | 0.16 (−1.23, 1.55) | −1.69 (−3.82, 0.44) |
| Increase in physical activity | 1.20 (0.71, 1.69) | 0.55 (−0.21, 1.31) | −0.29 (−1.68, 1.10) | 0.44 (−1.76, 2.64) |
|
Vitality
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | 0.07 (−0.38, 0.52) | −0.002 (−0.67, 0.66) | −0.12 (−1.33, 1.09) | −1.02 (−3.03, 0.99) |
| Some increase in physical activity | 0.27 (−0.16, 0.70) | 0.31 (−0.33, 0.95) | 0.35 (−0.76, 1.46) | −1.05 (−2.84, 0.74) |
| Increase in physical activity | 0.90 (0.51, 1.29) | 0.71 (0.09, 1.33) | 0.64 (−0.49, 1.77) | −0.32 (−2.21, 1.57) |
|
Social functioning
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | −0.15 (−0.64, 0.34) | −0.15 (−0.95, 0.65) | −0.50 (−2.00, 1.00) | −1.95 (−4.76, 0.86) |
| Some increase in physical activity | 0.53 (0.06, 1.00) | 0.82 (0.06, 1.58) | 0.62 (−0.77, 2.01) | 2.04 (−0.48, 4.56) |
| Increase in physical activity | 0.90 (0.47, 1.33) | 0.95 (0.23, 1.67) | 0.96 (−0.43, 2.35) | 4.51 (1.92, 7.10) |
|
Mental health
|
||||
| No change in physical activity | reference | Reference | reference | reference |
| Decrease in physical activity | 0.32 (−0.01, 0.65) | −0.06 (−0.57, 0.45) | −0.12 (−1.02, 0.78) | 0.21 (−1.29, 1.71) |
| Some increase in physical activity | 0.29 (−0.04, 0.62) | −0.05 (−0.52, 0.42) | 0.70 (−0.14, 1.54) | −0.81 (−2.16, 0.54) |
| Increase in physical activity | 0.33 (0.04, 0.62) | 0.44 (−0.03, 0.91) | −0.08 (−0.92, 0.76) | 1.00 (−0.39, 2.39) |
a
Age, baseline physical activity, baseline SF-36 score adjusted
SF-36, Medical Outcomes Study Short-Form 36 Health Status Survey