The question in the test and the 24 month prediction rule are two different things.
In general, we know that if a child with CP is able to sit independently by 24 months, this indicates that the child will be able to ambulate household distances at some point in the future. This information we don’t have is when this will happen in the future.
The exam question about what motor skill helps predict walking within 1 year of attainment is sit-to-stand. The ability of completing a sit to stand demonstrates that the child is gaining good strength and dynamic postural control. Once a child gets to this point, it can help guide a physical therapist’s decision making when it comes to goals and plan of care because they now know that the child will likely start walking within a year.
Does that make sense and help clarify the difference?