condition mean min max ZT0-3 73.617427 73.617427 73.617427 ZT4-7 69.6137155 69.6137155 69.6137155 ZT8-11 68.451927 68.451927 68.451927 ZT12-15 74.3740025 74.3740025 74.3740025 ZT16-19 75.1756755 75.1756755 75.1756755 ZT20-23 67.26424850000001 67.26424850000001 67.26424850000001