condition mean min max ZT0-3 1.23908449025 1.205419161 1.2727498195 ZT4-7 1.9460260625 1.278523937 2.613528188 ZT8-11 4.3966807569999995 3.8319112404999998 4.9614502735 ZT12-15 6.543419685249999 5.2477116184999995 7.839127752 ZT16-19 4.727084166 4.156646029 5.297522303 ZT20-23 8.262972459250001 7.085421235 9.4405236835