condition mean min max ZT0-3 11.623823 11.623823 11.623823 ZT4-7 10.7221685 10.7221685 10.7221685 ZT8-11 10.5890155 10.5890155 10.5890155 ZT12-15 10.946392 10.946392 10.946392 ZT16-19 11.396645500000002 11.396645500000002 11.396645500000002 ZT20-23 11.138798 11.138798 11.138798