condition mean min max ZT0-3 0.3485705 0.3485705 0.3485705 ZT4-7 0.2529705 0.2529705 0.2529705 ZT8-11 0.3501945 0.3501945 0.3501945 ZT12-15 0.5097835 0.5097835 0.5097835 ZT16-19 0.620712 0.620712 0.620712 ZT20-23 0.339067 0.339067 0.339067