condition mean min max ZT0-3 38.77568333333333 27.79955 44.786100000000005 ZT4-7 15.811200000000001 15.811200000000001 15.811200000000001 ZT8-11 23.71115 23.71115 23.71115 ZT12-15 44.73175 40.3836 49.079899999999995 ZT16-19 55.92555 55.92555 55.92555 ZT20-23 48.2926 48.2926 48.2926