condition mean min max ZT0-3 55.247625 49.5719 60.92335 ZT4-7 35.18285 35.18285 35.18285 ZT8-11 49.3346 49.3346 49.3346 ZT12-15 0 0 0 ZT16-19 72.5505 72.5505 72.5505 ZT20-23 77.8248 77.8248 77.8248