condition mean min max ZT0-3 27.017096 27.017096 27.017096 ZT4-7 38.624365 38.624365 38.624365 ZT8-11 25.0549375 25.0549375 25.0549375 ZT12-15 29.9696055 29.9696055 29.9696055 ZT16-19 56.790451000000004 56.790451000000004 56.790451000000004 ZT20-23 66.5991835 66.5991835 66.5991835