condition mean min max ZT0-3 1.5842028333333333 0.7889135 2.20546 ZT4-7 1.634375 1.634375 1.634375 ZT8-11 1.47153 1.47153 1.47153 ZT12-15 2.8778525000000004 2.122175 3.6335300000000004 ZT16-19 2.561035 2.561035 2.561035 ZT20-23 2.23972 2.23972 2.23972