condition mean min max ZT0-3 0.7252855 0.4222585 0.891366 ZT4-7 0.2739965 0.2739965 0.2739965 ZT8-11 0.282951 0.282951 0.282951 ZT12-15 0.22255450000000002 0.1378495 0.3072595 ZT16-19 0.5376460000000001 0.5376460000000001 0.5376460000000001 ZT20-23 1.36738 1.36738 1.36738