Prior to 2001, Texas did not have a high enough response rate in order to have weighted data; therefore, the estimates are only reflective of the sample and not generalizable to all high school students in Texas.
In 2003, Texas relied on data from Houston ISD, but when Houston ISD did not meet response rate criteria, they had to be excluded from the Texas sample. The data reported on the CDC website is Texas excluding Houston ISD.
In 2015, Texas fielded a statewide YRBS, but was unable to gain the required cooperation from schools and districts needed to reach the overall response rate for the data to be representative of all students in the state of Texas. For that reason, the data cannot be used.