condition mean min max ZT0-3 40.3446 40.3446 40.3446 ZT4-7 28.8904 28.8904 28.8904 ZT8-11 26.3467 26.3467 26.3467 ZT12-15 29.2823 29.2823 29.2823 ZT16-19 38.5416 38.5416 38.5416 ZT20-23 41.355149999999995 41.355149999999995 41.355149999999995