condition mean min max ZT0-3 15.860638439999999 10.15440411 21.56687277 ZT4-7 17.797917600749997 15.870980016499999 19.724855185 ZT8-11 7.0043266407499996 6.4102339905 7.598419291 ZT12-15 9.967397971499999 7.979196912999999 11.95559903 ZT16-19 11.63270381975 10.2299682095 13.03543943 ZT20-23 14.517054585 14.386021119999999 14.64808805