condition mean min max ZT0-3 0.3777295 0.3777295 0.3777295 ZT4-7 0.45008649999999994 0.45008649999999994 0.45008649999999994 ZT8-11 0.665735 0.665735 0.665735 ZT12-15 0.464234 0.464234 0.464234 ZT16-19 0.6608725 0.6608725 0.6608725 ZT20-23 0.826835 0.826835 0.826835