condition mean min max ZT0-3 706.889437 706.889437 706.889437 ZT4-7 636.165193 636.165193 636.165193 ZT8-11 517.5730455 517.5730455 517.5730455 ZT12-15 589.6126515000001 589.6126515000001 589.6126515000001 ZT16-19 665.3879525 665.3879525 665.3879525 ZT20-23 738.35268 738.35268 738.35268