condition mean min max ZT0-3 199.829113 199.829113 199.829113 ZT4-7 191.68124 191.68124 191.68124 ZT8-11 163.338841 163.338841 163.338841 ZT12-15 153.8194785 153.8194785 153.8194785 ZT16-19 97.547428 97.547428 97.547428 ZT20-23 92.08608749999999 92.08608749999999 92.08608749999999