at study entry = ?

1) slow progressors gained 0.6 fewer points per year ... than rapid progressors ? Does it mean "if rapid progreesors gain 6 points, then slow progressors gain 5.4points every year"?

2) at studay entry = ?

Context:
The investigators found that patients in the slow and intermediate groups maintained better performance on tests of cognitive function, global function, and complex activities of daily living than the rapid progressors. For example, slow progressors gained 0.6 fewer points per year on the ADAScog and intermediate progressors 0.8 fewer points per year than rapid progressors.


At study entry, the slow progressors also had a longer estimated duration of symptoms than intermediate or fast progressors, as well as higher IQ and education.