condition mean min max ZT0-3 5.83331 4.62349 7.04313 ZT4-7 4.32272 4.32272 4.32272 ZT8-11 5.743155 5.743155 5.743155 ZT12-15 0 0 0 ZT16-19 6.39598 6.39598 6.39598 ZT20-23 5.6457999999999995 5.6457999999999995 5.6457999999999995