Table 2. The matched pair 2x2 results of exposure to indomethacin and development of AKI.

		Exposed to indomethacin
		AKI a	No AKI	Total
Not exposed to indomethacin	AKI a	12	18	Incidence 30 (15.5% [95%CI 10.39:20.70])
	No AKI	53	110	163
	Total	Incidence 65 (33.7% [95%CI 26.95:40.40])	128	193
		OR 2.94 [95%CI 1.73:5.03], McNemar’s chi square p<0.001

Abbreviation: AKI = acute kidney injury

^aSerum creatinine or urine output criteria