condition mean min max ZT0-3 170.8 170.8 170.8 ZT4-7 190.8 190.8 190.8 ZT8-11 241.45 241.45 241.45 ZT12-15 156.65 156.65 156.65 ZT16-19 54.25 54.25 54.25 ZT20-23 61.25 61.25 61.25