condition mean min max ZT0-3 131.297365 131.297365 131.297365 ZT4-7 63.076136500000004 63.076136500000004 63.076136500000004 ZT8-11 30.3301045 30.3301045 30.3301045 ZT12-15 33.458665499999995 33.458665499999995 33.458665499999995 ZT16-19 43.0003775 43.0003775 43.0003775 ZT20-23 53.324839 53.324839 53.324839