condition mean min max ZT0-3 0.74795511175 0.0 1.4959102235 ZT4-7 1.21350532025 0.884869857 1.5421407834999998 ZT8-11 2.360482877 1.8028175535000002 2.9181482004999997 ZT12-15 2.45079794275 2.175621782 2.7259741035 ZT16-19 2.7524235215 2.679273326 2.825573717 ZT20-23 1.47572677025 0.9268981795 2.024555361