condition mean min max ZT0-3 0.922088 0.922088 0.922088 ZT4-7 0.1272615 0.1272615 0.1272615 ZT8-11 0.2872285 0.2872285 0.2872285 ZT12-15 0.3212345 0.3212345 0.3212345 ZT16-19 1.47762 1.47762 1.47762 ZT20-23 1.1144015 1.1144015 1.1144015