condition mean min max ZT0-3 0.4979435 0.4979435 0.4979435 ZT4-7 0.592282 0.592282 0.592282 ZT8-11 0.6489855 0.6489855 0.6489855 ZT12-15 0.9489164999999999 0.9489164999999999 0.9489164999999999 ZT16-19 0.8043555 0.8043555 0.8043555 ZT20-23 0.9103114999999999 0.9103114999999999 0.9103114999999999