condition mean min max ZT0-3 11.4022253015 5.961287523 16.84316308 ZT4-7 5.7650976145 3.706394427 7.823800802000001 ZT8-11 10.99412056075 8.294908602 13.6933325195 ZT12-15 17.188781605000003 14.874005215 19.503557995 ZT16-19 22.052934575 21.937131729999997 22.16873742 ZT20-23 15.9135377425 14.58799689 17.239078595000002