condition mean min max ZT0-3 16.4884323525 14.264817815 18.71204689 ZT4-7 12.965848472500001 11.732819630000002 14.198877315 ZT8-11 12.27716323 12.24741625 12.30691021 ZT12-15 7.44183320225 6.395358466999999 8.4883079375 ZT16-19 10.87206989225 8.9260354195 12.818104365 ZT20-23 21.34546387 18.891776595 23.799151145