condition mean min max ZT0-3 60.788258 60.788258 60.788258 ZT4-7 73.3444845 73.3444845 73.3444845 ZT8-11 67.351729 67.351729 67.351729 ZT12-15 79.8472285 79.8472285 79.8472285 ZT16-19 72.9355295 72.9355295 72.9355295 ZT20-23 125.458429 125.458429 125.458429