condition mean min max ZT0-3 40.26058333333333 18.3721 80.3485 ZT4-7 48.30245 48.30245 48.30245 ZT8-11 43.01675 43.01675 43.01675 ZT12-15 72.6394 63.89815 81.38065 ZT16-19 39.116 39.116 39.116 ZT20-23 24.296999999999997 24.296999999999997 24.296999999999997