Table 1. Change in perceived stress and negative affect as estimated with Linear Growth Curve Modeling.
| Perceived stress | Negative affect | |||||||
|---|---|---|---|---|---|---|---|---|
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| Fixed effect β (SE) | t | p | Random Effect: SD | β (SE) | t | p | Random Effect: SD | |
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| Time in weeks | ||||||||
| Intercept | 1.04 (0.09) | 11.57 | < 0.01 | 0.61 | 1.43 (0.08) | 17.32 | < 0.01 | 0.56 |
| Perceived stress t-1 | 0.25 (0.03) | 9.21 | < 0.01 | 0.12 | 0.26 (0.03) | 8.45 | < 0.01 | 0.17 |
| NA t-1 | ||||||||
| Time in weeks | -0.03 (0.02) | -1.94 | 0.05 | 0.09 | -0.03 (0.01) | -3.68 | < 0.01 | 0.03 |
| N weeks practiced | ||||||||
| Intercept | 1.01 (0.08) | 12.26 | < 0.01 | 0.56 | 1.49 (0.08) | 19.70 | < 0.01 | 0.49 |
| Perceived stress t-1 | 0.25 (0.03) | 9.53 | < 0.01 | 0.13 | 0.25 (0.03) | 8.39 | < 0.01 | 0.16 |
| NA t-1 | ||||||||
| Weeks of practice | -0.06 (0.03) | -2.16 | 0.03 | 0.14 | -0.04 (0.01) | -4.36 | < 0.01 | 0.02 |
Note: Time in weeks = days since the start of MBSR/7, weeks of practice = number of days of mindfulness practice so far/7. The presented multilevel models included 71 individuals and 2111 observations.