condition mean min max ZT0-3 39.576 34.1286 43.3554 ZT4-7 26.5484 26.5484 26.5484 ZT8-11 25.6535 25.6535 25.6535 ZT12-15 35.30015 34.6721 35.9282 ZT16-19 30.528950000000002 30.528950000000002 30.528950000000002 ZT20-23 43.8209 43.8209 43.8209