condition mean min max ZT0-3 7.000515 6.6678049999999995 7.3332250000000005 ZT4-7 8.374645 8.374645 8.374645 ZT8-11 24.483249999999998 24.483249999999998 24.483249999999998 ZT12-15 0 0 0 ZT16-19 16.824650000000002 16.824650000000002 16.824650000000002 ZT20-23 6.646875 6.646875 6.646875