condition mean min max ZT0-3 68.87035 68.87035 68.87035 ZT4-7 63.6106 63.6106 63.6106 ZT8-11 63.61545 63.61545 63.61545 ZT12-15 51.32385 51.32385 51.32385 ZT16-19 68.40895 68.40895 68.40895 ZT20-23 64.8048 64.8048 64.8048