13514
For olanzapine ( the antipsychotic associated with highest mean weight gain in the total drug cohort ) , the percentage of patients gaining >= 7 % baseline weight was 45 % ( 95 % CI : 43 - 48 ) in the underweight / normal weight BMI cohort and 20 % ( 95 % CI : 15 - 27 ) in the obese BMI cohort ; 7 % ( 95 % CI : 6 - 8 ) of the underweight / normal cohort and 19 % ( 95 % CI : 13 - 27 ) of the obese cohort lost >= 7 % baseline weight .
 olanzapine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 olanzapine