condition mean min max ZT0-3 0.627032 0.627032 0.627032 ZT4-7 0.120602 0.120602 0.120602 ZT8-11 0.2508945 0.2508945 0.2508945 ZT12-15 0.9065375 0.9065375 0.9065375 ZT16-19 0.857406 0.857406 0.857406 ZT20-23 0.127026 0.127026 0.127026