442
Behaviorally , a pain - tolerant group ( PT = 29 Ss ) tolerated the entire 3 - min test ( means = 180 + / - 0 sec ) , while a pain - sensitive group ( PS = 13 Ss ) averaged only 50 . 31 + / - 20 . 81 sec of the cold - pressor test ( t = 16 . 75 , P less than 0 . 0001 ) , replicating our earlier studies .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None