condition mean min max ZT0-3 14.03255 12.84545 15.219650000000001 ZT4-7 11.700949999999999 11.700949999999999 11.700949999999999 ZT8-11 17.0102 17.0102 17.0102 ZT12-15 0 0 0 ZT16-19 20.08715 20.08715 20.08715 ZT20-23 15.71705 15.71705 15.71705