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Table 2 Power calculations for main effects and interactions

From: Motor control or graded activity exercises for chronic low back pain? A randomised controlled trial

Main effect

Interaction

Outcome (SD)

1.0

2.0

Pain intensity scale (SD = 2.0) [23, 48]

1

2

Patient Specific Functional Scale (SD = 1.8) [23, 48, 49]

2.5

5

Roland Morris Disability Questionnaire (SD = 4.9) [24]

1

2

Global Perceived Effects Scale (SD = 2.0) [22, 23]