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Table 1 Comparison of three independent models

From: Long-acting beta-agonists reduce mortality of patients with severe and very severe chronic obstructive pulmonary disease: a propensity score matching study

Model 1 2 3
Propensity score matched? No Yes Yes
Any difference between cohorts? Yes (not much) No No
Single- or multi-variable analysis? Multi- Single- Multi-
Number of patients 591 492 492