condition mean min max ZT0-3 238.623806 238.623806 238.623806 ZT4-7 498.2510115 498.2510115 498.2510115 ZT8-11 378.2655065 378.2655065 378.2655065 ZT12-15 218.2481675 218.2481675 218.2481675 ZT16-19 126.948293 126.948293 126.948293 ZT20-23 101.576 101.576 101.576