condition mean min max ZT0-3 42.321151 42.321151 42.321151 ZT4-7 41.132121 41.132121 41.132121 ZT8-11 43.556685 43.556685 43.556685 ZT12-15 41.7255165 41.7255165 41.7255165 ZT16-19 45.659403999999995 45.659403999999995 45.659403999999995 ZT20-23 46.520523 46.520523 46.520523