condition mean min max ZT0-3 0.608628 0.608628 0.608628 ZT4-7 0.5025515 0.5025515 0.5025515 ZT8-11 0.5564020000000001 0.5564020000000001 0.5564020000000001 ZT12-15 0.4414345 0.4414345 0.4414345 ZT16-19 0.7534185 0.7534185 0.7534185 ZT20-23 0.6365765000000001 0.6365765000000001 0.6365765000000001