condition mean min max ZT0-3 9.367625 9.367625 9.367625 ZT4-7 10.311684 10.311684 10.311684 ZT8-11 10.9861915 10.9861915 10.9861915 ZT12-15 10.1375515 10.1375515 10.1375515 ZT16-19 12.433784 12.433784 12.433784 ZT20-23 12.0773845 12.0773845 12.0773845