condition mean min max ZT0-3 13.5 13.5 13.5 ZT4-7 6.8 6.8 6.8 ZT8-11 44.5 44.5 44.5 ZT12-15 8.149999999999999 8.149999999999999 8.149999999999999 ZT16-19 9.85 9.85 9.85 ZT20-23 35.85 35.85 35.85