condition mean min max ZT0-3 30.129274 30.129274 30.129274 ZT4-7 37.112230999999994 37.112230999999994 37.112230999999994 ZT8-11 42.455661 42.455661 42.455661 ZT12-15 40.433267 40.433267 40.433267 ZT16-19 34.7083875 34.7083875 34.7083875 ZT20-23 30.372025 30.372025 30.372025