condition mean min max ZT0-3 25.463694 25.463694 25.463694 ZT4-7 19.725512 19.725512 19.725512 ZT8-11 19.7681045 19.7681045 19.7681045 ZT12-15 24.8396155 24.8396155 24.8396155 ZT16-19 20.461475 20.461475 20.461475 ZT20-23 26.0754245 26.0754245 26.0754245