condition mean min max ZT0-3 49.16815 46.125550000000004 52.21075 ZT4-7 31.29045 31.29045 31.29045 ZT8-11 17.3473 17.3473 17.3473 ZT12-15 0 0 0 ZT16-19 22.563299999999998 22.563299999999998 22.563299999999998 ZT20-23 47.02875 47.02875 47.02875