condition mean min max ZT0-3 26.45055 23.38275 29.518349999999998 ZT4-7 40.69065 40.69065 40.69065 ZT8-11 26.4972 26.4972 26.4972 ZT12-15 0 0 0 ZT16-19 31.22215 31.22215 31.22215 ZT20-23 41.3253 41.3253 41.3253