Hi,
I am applying for SSDI, I will only qualify for medicare because I did not work for Social Security wages for 5 out of the last 10 years. I was an Illinois teacher and we pay into a pension fund. So I do not have the requisite number of years to qualify for monthly checks.
Your wages are not calculated by each state, this is a federal program, but administered by each state. Your eligibility will be determined by the state as the last day you were able to perform your usual work duties.
Did you pay Soc Sec taxes in TX? Here is another link to try--it might answer your questions as well.
http://www.ssa.gov/disability/
hope this helps you a bit--lifesaver54