condition mean min max ZT0-3 56.097492 56.097492 56.097492 ZT4-7 61.242487 61.242487 61.242487 ZT8-11 71.47254699999999 71.47254699999999 71.47254699999999 ZT12-15 77.7937795 77.7937795 77.7937795 ZT16-19 17.5209115 17.5209115 17.5209115 ZT20-23 20.0659835 20.0659835 20.0659835