Table 5 ANCOVA analysis of comparing the VAS of two groups in 2 h by adjusting the pain score pre-injection
Sources of effect | SS | df | σ2 | F | p-value |
|---|---|---|---|---|---|
Modified model | 66.448 | 3 | 22.149 | 7.273 | 0.0001 |
Constant | 374.668 | 1 | 374.668 | 123.032 | 0.0001 |
Group | 13.63 | 1 | 13.63 | 4.476 | 0.039 |
Pain score before injection | 50.03 | 1 | 50.03 | 16.429 | 0.0001 |
Interaction of group-pain score before injection | 6.001 | 1 | 6.001 | 1.971 | 0.166 |
Error | 170.536 | 56 | 3.045 | ||
Total | 607 | 60 | |||
Total modified | 236.983 | 59 |