condition mean min max ZT0-3 65.94999999999999 65.94999999999999 65.94999999999999 ZT4-7 37.6 37.6 37.6 ZT8-11 58.05 58.05 58.05 ZT12-15 67.7 67.7 67.7 ZT16-19 38.1 38.1 38.1 ZT20-23 53.2 53.2 53.2