condition mean min max ZT0-3 4.523813195 4.120829657 4.926796733 ZT4-7 6.280250703250001 4.5014445565 8.059056850000001 ZT8-11 7.699455009999999 6.966495639500001 8.4324143805 ZT12-15 4.8863889525 3.3400986589999997 6.432679246 ZT16-19 6.984990615499999 5.904549261 8.065431969999999 ZT20-23 15.571588140000001 12.528624475 18.614551805