condition mean min max ZT0-3 271.7 271.7 271.7 ZT4-7 159.1 159.1 159.1 ZT8-11 170.75 170.75 170.75 ZT12-15 179.55 179.55 179.55 ZT16-19 153.2 153.2 153.2 ZT20-23 197.89999999999998 197.89999999999998 197.89999999999998