Table 5.
Model | 1 | 2 | 3 | 4 | ||||||
Treatment effects | Est | SE | Est | SE | Est | SE | Est | SE | ||
Fixed effects |
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||
|
Intercept | 6.31d | 0.19 | 6.70d | 0.22 | 6.98d | 0.26 | 7.20d | 0.26 | |
|
Lineara |
|
|
–0.18d | 0.05 | –0.60d | 0.22 | –2.49d | 0.66 | |
|
Quadraticb |
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|
|
0.07d | 0.03 | 1.37d | 0.43 | |
|
Cubicc |
|
|
|
|
|
|
–0.17d | 0.05 | |
Random effects |
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||
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σ2 within participants | 10.89d | 0.60 | 10.75d | 0.61 | 10.66d | 0.61 | 10.44d | 0.58 | |
|
σ2 between participants | 5.68d | 0.79 |
|
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|
Intercept |
|
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6.46d | 1.08 | 6.92d | 1.09 | 7.05d | 1.08 |
|
|
Intercept, slope |
|
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–0.21 | 0.16 | –0.28 | 0.15 | –0.31d | 0.14 |
|
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Slope |
|
|
0.00 | 0.00 | 0.01 | 0.00 | 0.01 | 0.00 |
Model fit indexes |
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||
|
AIC | 5708.19 |
|
5693.92 |
|
5692.41 |
|
5686.56 |
|
|
|
–2LL (χ2) | 5702.19 |
|
5681.92 |
|
5678.41 |
|
5670.56 |
|
|
|
R 2 (level 1) |
|
|
0.01 |
|
0.02 |
|
0.04 |
|
aLinear: 0 = baseline, 1 = 1 month, 2 = 2 months, 6 = 6 months.
bQuadratic: 0 = baseline, 1 = 1 month, 4 = 2 months, 36 = 6 months.
cCubic: 0 = baseline, 1 = 1 month, 8 = 2 months, 216 = 6 months.
d P<.05.