condition mean min max ZT0-3 54.6435417025 48.229068175 61.05801523 ZT4-7 6.564106275 3.8933593060000002 9.234853244 ZT8-11 11.043742743500001 5.868986233 16.218499254 ZT12-15 15.6002274125 15.26284897 15.937605855000001 ZT16-19 17.3020059025 16.529848134999998 18.074163669999997 ZT20-23 21.902187067499998 21.36975098 22.434623154999997