condition mean min max ZT0-3 12.8974551875 11.766927035 14.02798334 ZT4-7 22.43339498 21.81275027 23.05403969 ZT8-11 28.36106928 28.31036658 28.411771979999997 ZT12-15 24.917314015000002 23.94216261 25.89246542 ZT16-19 16.80765199 15.238872663333334 18.376431316666668 ZT20-23 12.0755629975 11.501771031666667 12.649354963333334