condition mean min max ZT0-3 0.031894 0.0 0.095682 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.21058800000000003 0.109026 0.31215000000000004 ZT16-19 0.1870715 0.1870715 0.1870715 ZT20-23 0.422059 0.422059 0.422059