Table II.

Effect of treatment group on Short Form-12 physical component scores (PCS) at 12 months

	Mean difference between 12-month PCS (95% CI)*
At high pressure
Soap vs saline	1.18 (0.02 to 2.33)
At low pressure
Soap vs saline	0.45 (-0.71 to 1.61)
At very low pressure
Soap vs saline	-0.99 (-2.16 to 0.18)
With soap
High vs low	-0.12 (-1.28 to 1.04)
High vs very low	0.51 (-0.64 to 1.67)
Low vs very low	0.63 (-0.53 to 1.79)
With saline
High vs low	-0.84 (-2.00 to 0.31)
High vs very low	-1.65 (-2.82 to -0.48)
Low vs very low	-0.81 (-1.98 to 0.36)

^*from the main 3-level model

CI, confidence interval