condition mean min max ZT0-3 0.0358677 0.0358677 0.0358677 ZT4-7 0.02495985 0.02495985 0.02495985 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.032263349999999996 0.032263349999999996 0.032263349999999996