condition mean min max ZT0-3 0.051388994 0.039191910999999996 0.063586077 ZT4-7 0.07466930050000001 0.0686866315 0.0806519695 ZT8-11 0.274291554 0.17914945850000003 0.36943364949999996 ZT12-15 0.70859852225 0.592972343 0.8242247015 ZT16-19 0.47770193725 0.4300830495 0.525320825 ZT20-23 0.51650411475 0.4451627815 0.5878454479999999