condition mean min max ZT0-3 4.69110522575 3.7718684355 5.610342016000001 ZT4-7 7.456887103 7.124824696 7.78894951 ZT8-11 4.2736265765 4.062786505 4.484466648 ZT12-15 5.4762343927499995 4.4623589335 6.490109852 ZT16-19 7.440667731 6.478305202 8.40303026 ZT20-23 17.459655259999998 13.45732902 21.4619815