condition mean min max ZT0-3 2.464276499 0.9149158209999999 4.013637177 ZT4-7 5.606142961250001 5.3282167395 5.884069183 ZT8-11 4.518549874500001 4.508953502000001 4.5281462470000005 ZT12-15 4.72509579175 4.383948514 5.0662430695000005 ZT16-19 5.1452643245 4.20890399 6.081624659000001 ZT20-23 9.8901109545 8.699207849 11.081014060000001