condition mean min max ZT0-3 11.93825 11.535499999999999 12.341000000000001 ZT4-7 10.819849999999999 10.819849999999999 10.819849999999999 ZT8-11 10.12434 10.12434 10.12434 ZT12-15 0 0 0 ZT16-19 12.03481 12.03481 12.03481 ZT20-23 15.6081 15.6081 15.6081