condition mean min max ZT0-3 0.2198715 0.112055 0.327688 ZT4-7 0.3289025 0.3289025 0.3289025 ZT8-11 0.334531 0.334531 0.334531 ZT12-15 0 0 0 ZT16-19 0.054302 0.054302 0.054302 ZT20-23 0.0 0.0 0.0