Blackstone
Brigadier
Look at the 5 campaigns waged by the PVA. In the first 3 campaigns, the PVA was on the offensive. The 3rd campaign ended with the PVA taking Seoul. In the 4th campaign, the PVA was forced to retreat, and in the 5th campaign, the frontline remained at the 38th parallel.
The casualties sustained by the PVA was far higher in each of the 4th and 5th campaigns were higher than their casualties in the first 3 campaigns combined. The 5th campaign was especially brutal, as that is where the PVA fought most of their defensive actions.
That's very interesting information. Can you provide links to casualty numbers? Word of mouth battle accounts are important historical references, but they're not enough by themselves to give reasonably accurate and balanced reports.