condition mean min max ZT0-3 31.235500000000002 30.93735 31.53365 ZT4-7 58.38665 58.38665 58.38665 ZT8-11 51.063500000000005 51.063500000000005 51.063500000000005 ZT12-15 0 0 0 ZT16-19 39.304649999999995 39.304649999999995 39.304649999999995 ZT20-23 34.3031 34.3031 34.3031