condition mean min max ZT0-3 904.628589 904.628589 904.628589 ZT4-7 812.8335155 812.8335155 812.8335155 ZT8-11 794.4157655 794.4157655 794.4157655 ZT12-15 975.7702705 975.7702705 975.7702705 ZT16-19 827.7750025 827.7750025 827.7750025 ZT20-23 949.094088 949.094088 949.094088