Predicting cup size after reduction mammaplasty

A paired sample t test showed no significant difference between actual and predicted weight of reduction for using Method A or C. Method B systematically underestimated the weight of tissue to be removed. The mean estimate for Method B was 730 g, a difference of −45 g (CI: −81.7 to −8.9; p=0.015). For Method A, the mean was 765.5 g, a difference of 9.4 g (CI: −68.1 to 49.3; p=0.75). This compared to Method C where the mean predicted weight of tissue to be removed was 770.4 g, a difference of −4.5 g (95% CI: −42.4 to 33.4; p=0.81). The implications of these findings are discussed.