condition mean min max ZT0-3 2.03957 2.03957 2.03957 ZT4-7 2.38996 2.38996 2.38996 ZT8-11 8.40238 8.40238 8.40238 ZT12-15 0.0 0.0 0.0 ZT16-19 2.067025 2.067025 2.067025 ZT20-23 2.071685 2.071685 2.071685