condition mean min max ZT0-3 4.25766080075 3.133408377 5.3819132245 ZT4-7 9.23262539725 7.5854919295 10.879758865 ZT8-11 12.23297315875 9.8900641025 14.575882215 ZT12-15 48.209207045 41.755089335 54.663324755000005 ZT16-19 45.54061379 42.053205995 49.028021585000005 ZT20-23 37.926874767499996 36.95448945 38.899260085