condition mean min max ZT0-3 9.6828475 9.023344999999999 10.34235 ZT4-7 6.3431049999999995 6.3431049999999995 6.3431049999999995 ZT8-11 22.2121 22.2121 22.2121 ZT12-15 0 0 0 ZT16-19 18.822650000000003 18.822650000000003 18.822650000000003 ZT20-23 12.427700000000002 12.427700000000002 12.427700000000002