condition mean min max ZT0-3 7.6472925 7.621874999999999 7.67271 ZT4-7 8.229925000000001 8.229925000000001 8.229925000000001 ZT8-11 5.350235 5.350235 5.350235 ZT12-15 0 0 0 ZT16-19 10.032995 10.032995 10.032995 ZT20-23 8.84808 8.84808 8.84808