condition mean min max ZT0-3 170.64999999999998 170.64999999999998 170.64999999999998 ZT4-7 274.5 274.5 274.5 ZT8-11 217.75 217.75 217.75 ZT12-15 231.4 231.4 231.4 ZT16-19 145.9 145.9 145.9 ZT20-23 142.4 142.4 142.4