condition mean min max ZT0-3 2059.3999999999996 2059.3999999999996 2059.3999999999996 ZT4-7 1706.7 1706.7 1706.7 ZT8-11 2389.1 2389.1 2389.1 ZT12-15 1411.8000000000002 1411.8000000000002 1411.8000000000002 ZT16-19 1760.1 1760.1 1760.1 ZT20-23 2658.0 2658.0 2658.0