condition mean min max ZT0-3 26.654 26.654 26.654 ZT4-7 18.7832 18.7832 18.7832 ZT8-11 19.353250000000003 19.353250000000003 19.353250000000003 ZT12-15 16.98755 16.98755 16.98755 ZT16-19 30.81295 30.81295 30.81295 ZT20-23 30.7468 30.7468 30.7468