1166
In the multiple regression analysis of life birth , mid - follicular hCG ( p = 0 . 016 ) was identified as a positive predictor , and age ( p = 0 . 004 ) and mid - follicular progesterone ( p = 0 . 029 ) as negative predictors .
 progesterone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 progesterone