condition mean min max ZT0-3 0.169649942 0.0 0.339299884 ZT4-7 0.33117664375 0.32888253149999996 0.333470756 ZT8-11 1.11408144675 0.7786176985 1.449545195 ZT12-15 3.11760573025 3.0257805515 3.209430909 ZT16-19 3.23520691475 2.9852494465 3.485164383 ZT20-23 2.341269685 2.0055271145 2.6770122554999998