condition mean min max ZT0-3 8.87713999025 8.86663145 8.8876485305 ZT4-7 2.85425004075 2.3437617105 3.364738371 ZT8-11 2.63697425575 2.117956195 3.1559923165 ZT12-15 5.688013806999999 3.8326968 7.543330813999999 ZT16-19 6.7178738540000005 6.339468424500001 7.0962792834999995 ZT20-23 9.47597013625 9.220248299 9.7316919735