condition mean min max ZT0-3 20.20279275 16.52901367 23.87657183 ZT4-7 22.7975281925 22.416661315 23.17839507 ZT8-11 37.51607661 26.32787241 48.70428081 ZT12-15 64.64561035 64.461145065 64.830075635 ZT16-19 72.3717713325 70.620816825 74.12272584 ZT20-23 64.17728035 63.741099659999996 64.61346104