condition mean min max ZT0-3 855.2 855.2 855.2 ZT4-7 931.4 931.4 931.4 ZT8-11 904.5999999999999 904.5999999999999 904.5999999999999 ZT12-15 908.5 908.5 908.5 ZT16-19 979.0999999999999 979.0999999999999 979.0999999999999 ZT20-23 818.4 818.4 818.4