The numbers of ablation sites with an oesophageal temperature of > 42C were 1.7 1.4 and 2.6 1.7 in the oesophageal cooling group and the control group , respectively ( P = 0.04 ) , and the maximal oesophageal temperature at those sites was 43.0 0.6 and 44.7 0.9 C ( P < 0.0001 ) .