condition mean min max ZT0-3 59.571862 59.571862 59.571862 ZT4-7 35.1975135 35.1975135 35.1975135 ZT8-11 33.7843835 33.7843835 33.7843835 ZT12-15 67.7692495 67.7692495 67.7692495 ZT16-19 63.94154449999999 63.94154449999999 63.94154449999999 ZT20-23 151.3216395 151.3216395 151.3216395