Before matching, 130 of 141 variables (92%) had standardized differences of less than 10% (variables with differences >10% were sex; Local Health Integration Network; prescriber type; history of psoriasis, dermatomyositis, or systemic lupus erythematosus; concurrent use of glucocorticoids; and receipt of a chest radiograph, mammography, serum thyroid-stimulating hormone test, or serum parathyroid hormone test in the prior 12 months) (eTable 8 in Supplement 1). Here, PTH is linked to systemic lupus erythematosus.