condition mean min max ZT0-3 16.4007978325 12.315779595 20.48581607 ZT4-7 13.5226657025 10.758327485 16.28700392 ZT8-11 27.6042916525 21.776696854999997 33.43188645 ZT12-15 29.159497655 26.57743621 31.7415591 ZT16-19 18.7596836275 18.53548445 18.983882805 ZT20-23 18.4143812225 18.138884615000002 18.68987783