condition mean min max ZT0-3 59.012193 59.012193 59.012193 ZT4-7 66.6323515 66.6323515 66.6323515 ZT8-11 83.88708399999999 83.88708399999999 83.88708399999999 ZT12-15 74.1114825 74.1114825 74.1114825 ZT16-19 56.749071 56.749071 56.749071 ZT20-23 52.3165805 52.3165805 52.3165805