condition mean min max ZT0-3 44.432498 44.432498 44.432498 ZT4-7 52.885759 52.885759 52.885759 ZT8-11 48.557 48.557 48.557 ZT12-15 45.9962875 45.9962875 45.9962875 ZT16-19 31.8474935 31.8474935 31.8474935 ZT20-23 36.711732 36.711732 36.711732