condition mean min max ZT0-3 3.845015 3.845015 3.845015 ZT4-7 2.699255 2.699255 2.699255 ZT8-11 3.65952 3.65952 3.65952 ZT12-15 4.596175 4.596175 4.596175 ZT16-19 5.315125 5.315125 5.315125 ZT20-23 3.630905 3.630905 3.630905