condition mean min max ZT0-3 0.4112883333333333 0.198921 0.6423805 ZT4-7 1.363595 1.363595 1.363595 ZT8-11 0.8902935000000001 0.8902935000000001 0.8902935000000001 ZT12-15 4.40985 1.49039 7.3293099999999995 ZT16-19 5.57943 5.57943 5.57943 ZT20-23 1.63552 1.63552 1.63552