condition mean min max ZT0-3 17.211599999999997 17.211599999999997 17.211599999999997 ZT4-7 13.7987 13.7987 13.7987 ZT8-11 18.399 18.399 18.399 ZT12-15 17.91125 17.91125 17.91125 ZT16-19 21.8355 21.8355 21.8355 ZT20-23 16.851300000000002 16.851300000000002 16.851300000000002