But data is lacking about how long the pounds stay off.

On the other hand, the limitation is that data obtained in an artificial environment may lack generalizability.

Computer projections often took on an absurd quality when substantial data was lacking.

Clinical data supporting routine use in cancer patients are lacking.

That may also apply to men, she says, but data are lacking.

Long-term data on safety and efficacy are still lacking.

But hard data on the problem were lacking.

It may be taken by local inshore fisheries, but data is lacking.

Experts say the vaccine seems reasonably safe but definitive data on this point too are lacking.

Reliable data on the distribution of important contaminants is lacking.