condition mean min max ZT0-3 1.48335325 1.370945 1.5957615 ZT4-7 10.6273 10.6273 10.6273 ZT8-11 3.2811000000000003 3.2811000000000003 3.2811000000000003 ZT12-15 0 0 0 ZT16-19 3.298895 3.298895 3.298895 ZT20-23 3.214805 3.214805 3.214805