Treatment was stopped more often in the nortriptyline group ( @ -LSB- @ % -LCB- @ % CI , @ % -@ % -RCB- -RSB- ) than in the placebo group ( @ -LSB- @ % -RSB- -LCB- @ % CI , @ % -@ % -RCB- -RSB- ) ( P = @ ) , but numbers of adverse events were not different ( @ -LSB- @ % CI , @-@ -RSB- vs @ -LSB- @ % CI , @-@ -RSB- ) ( P = @ ) .