condition mean min max ZT0-3 9.741561666666666 7.91689 11.574259999999999 ZT4-7 4.588975 4.588975 4.588975 ZT8-11 3.077725 3.077725 3.077725 ZT12-15 4.1570075 3.765465 4.54855 ZT16-19 5.830275 5.830275 5.830275 ZT20-23 10.767835 10.767835 10.767835