condition mean min max ZT0-3 13.055019 13.055019 13.055019 ZT4-7 13.6847195 13.6847195 13.6847195 ZT8-11 12.7698225 12.7698225 12.7698225 ZT12-15 13.336298 13.336298 13.336298 ZT16-19 11.8192385 11.8192385 11.8192385 ZT20-23 12.529122000000001 12.529122000000001 12.529122000000001