condition mean min max ZT0-3 26.65 26.65 26.65 ZT4-7 57.1 57.1 57.1 ZT8-11 9.25 9.25 9.25 ZT12-15 12.149999999999999 12.149999999999999 12.149999999999999 ZT16-19 32.65 32.65 32.65 ZT20-23 29.6 29.6 29.6