condition mean min max ZT0-3 19.45018333333333 17.96635 20.399299999999997 ZT4-7 13.4254 13.4254 13.4254 ZT8-11 8.67379 8.67379 8.67379 ZT12-15 13.136849999999999 12.82325 13.45045 ZT16-19 11.70865 11.70865 11.70865 ZT20-23 15.39115 15.39115 15.39115