condition mean min max ZT0-3 5.6485725 5.510675 5.78647 ZT4-7 5.213305 5.213305 5.213305 ZT8-11 5.223509999999999 5.223509999999999 5.223509999999999 ZT12-15 0 0 0 ZT16-19 6.45242 6.45242 6.45242 ZT20-23 6.175555 6.175555 6.175555