condition mean min max ZT0-3 11.8596 10.456 13.06085 ZT4-7 10.668035 10.668035 10.668035 ZT8-11 10.701035000000001 10.701035000000001 10.701035000000001 ZT12-15 15.026475 13.909949999999998 16.143 ZT16-19 14.221250000000001 14.221250000000001 14.221250000000001 ZT20-23 17.33995 17.33995 17.33995