9008
Gestational weight gain <= 5 kg was associated with lower birth weight z score ( P = 0 . 008 ) , lower rates of large - for - gestational - age ( LGA ) infants ( 12 vs . 39 % , P = 0 . 041 ) , delivery closer to term ( 268 vs . 262 days , P = 0 . 039 ) , and less perinatal morbidity ( 35 vs . 71 % , P = 0 . 024 ) compared with pregnancies with maternal weight gain > 5 kg .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None