31. For those initially tested in the morning, a confirmatory morning test may be advised. 32. The VA did its own confirmatory HIV test on Malone and found he was negative. 33. He said confirmatory results from the contacts would not be available for another two weeks. 34. The FDA began strict confirmatory testing Thursday. 35. Models can be compared to each other by exploratory data analysis or confirmatory data analysis. 36. In confirmatory analysis, a previously formulated model or models are compared to the data. 37. Statistical hypothesis testing is sometimes called "'confirmatory data analysis " '. 38. Malignant hyperthermia is diagnosed on clinical grounds, but various laboratory investigations may prove confirmatory . 39. Moreover, MS / MS gives only the screening result and not the confirmatory result. 40. Gas chromatography / mass spectrometry ( GC / MS ) is the recommended confirmatory method.