condition mean min max ZT0-3 33.670275000000004 26.5351 40.80545 ZT4-7 22.1283 22.1283 22.1283 ZT8-11 21.804299999999998 21.804299999999998 21.804299999999998 ZT12-15 0 0 0 ZT16-19 56.124849999999995 56.124849999999995 56.124849999999995 ZT20-23 29.308300000000003 29.308300000000003 29.308300000000003