condition mean min max ZT0-3 0.603488106 0.56166346 0.645312752 ZT4-7 2.79440595075 1.003793796 4.5850181055 ZT8-11 11.464979112249999 7.6626752845 15.26728294 ZT12-15 18.0271752925 16.479455785 19.574894800000003 ZT16-19 15.3700781325 13.99280697 16.747349295 ZT20-23 20.36537169 20.033413225 20.697330155