condition mean min max ZT0-3 46.33825 46.33825 46.33825 ZT4-7 22.5945 22.5945 22.5945 ZT8-11 17.61705 17.61705 17.61705 ZT12-15 15.482050000000001 15.482050000000001 15.482050000000001 ZT16-19 32.7038 32.7038 32.7038 ZT20-23 49.5032 49.5032 49.5032