condition mean min max ZT0-3 0.0195233 0.0195233 0.0195233 ZT4-7 0.0227001 0.0227001 0.0227001 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 0.01965615 0.01965615 0.01965615