condition mean min max ZT0-3 78.868487 78.868487 78.868487 ZT4-7 73.2718595 73.2718595 73.2718595 ZT8-11 95.036873 95.036873 95.036873 ZT12-15 86.927416 86.927416 86.927416 ZT16-19 115.7208755 115.7208755 115.7208755 ZT20-23 95.95419 95.95419 95.95419