condition mean min max ZT0-3 2.883148542 2.368516609 3.397780475 ZT4-7 2.102663979 1.8189598560000002 2.386368102 ZT8-11 2.238754376 2.1188698275 2.3586389245 ZT12-15 2.3020202945 1.9810270055 2.6230135835 ZT16-19 2.272269133 1.9570336730000002 2.5875045930000002 ZT20-23 4.628011678 3.9763676095 5.2796557465