The International Telecommunication Union has a project for developing objective quality models called Parametric Bitstream-Based Quality Assessment of Cloud Gaming services. The model will be divided into an interaction quality module and a video coding impairment module. To evaluate these two modules an experimental campaign was conducted where labs from different parts of the world performed user studies to collect data for the evaluation. This paper describes an experiment for collecting data to evaluate the video coding impairment module. The analysis is based on a bootstrapping approach.