RESULTS	In each of the five segments , the visibility score was significantly higher in group B than in group A ( segment 1 : 4.3 0.7 vs 4.7 0.5 , P = 0.03 ; segment 2 : 4.2 0.9 vs 4.8 0.4 , P = 0.01 ; segment 3 : 4.0 1.0 vs 4.6 0.7 , P = 0.04 ; segment 4 : 3.6 1.1 vs 4.5 0.6 , P = 0.003 ; segment 5 : 2.7 1.0 vs 4.4 0.8 , P = 0.00004 ) .\