condition mean min max ZT0-3 15.36945 15.36945 15.36945 ZT4-7 14.8367 14.8367 14.8367 ZT8-11 9.900755 9.900755 9.900755 ZT12-15 12.228 12.228 12.228 ZT16-19 16.64845 16.64845 16.64845 ZT20-23 14.568200000000001 14.568200000000001 14.568200000000001