The two groups, receiving either oxygen or air, showed similar baseline characteristics (Table I).

Multivariate Cox proportional hazard models were used to estimate independent associations of baseline characteristics with 2-year mortality.

The remaining baseline characteristics were similarly examined for associations with 2-year survival after discharge.

Patients' baseline characteristics were similar in both groups, as shown in Table I.

Participants in the two drug groups had similar baseline characteristics when stratified by HF status.

It is then important to check the key outcome-correlated baseline characteristics between the treatment groups for any incomparability among these subgroup patients.

We evaluated the association between baseline characteristics and the risk of hospitalization for asthma during the ensuing 18-month follow-up period, reported at the 18-month interview.

It is important that only baseline characteristics be considered in investigating imbalance.

Recommended weight gains during pregnancy vary according to maternal baseline characteristics.

The baseline characteristics of the subjects varied according to severity of periodontal disease (table I).