condition mean min max ZT0-3 13.087700000000002 13.087700000000002 13.087700000000002 ZT4-7 13.926749999999998 13.926749999999998 13.926749999999998 ZT8-11 10.27212 10.27212 10.27212 ZT12-15 10.32624 10.32624 10.32624 ZT16-19 12.37435 12.37435 12.37435 ZT20-23 11.76145 11.76145 11.76145