Question: is this a 2) strong advice, 1) weak advice 0) no advice?

In patients with OHS, a 3-month comprehensive rehabilitation programme, in addition to NIV, resulted in improved weight loss, exercise capacity and QOL at the end of the rehabilitation period, but these effects were  not demonstrated at 12 months, in part, due to the limited retention of patients  at 12 months.
user
This is no advice
assistant