condition mean min max ZT0-3 0.0765875 0.0 0.2297625 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.13090275 0.0 0.2618055 ZT16-19 0.0 0.0 0.0 ZT20-23 0.2579715 0.2579715 0.2579715