Table 2. Associations Between Current, Incident, and Long-term Use of NSAIDs in the Main Propensity-Matched Study Cohort.

Exposure	Risk among NSAID use cohort, % (95% CI)	Risk among NSAID nonuse cohort, % (95% CI)	Risk difference, % (95% CI)	Risk ratio (95% CI)
Intensive care unit admission
Current use	20.0 (16.6 to 23.4)	16.0 (12.8 to 19.1)	4.0 (–0.6 to 8.7)	1.25 (0.96 to 1.63)
Incident use	25.0 (13.7 to 36.3)	17.9 (7.8 to 27.9)	7.1 (–8.0 to 22.3)	1.40 (0.68 to 2.88)
Long-term use	28.2 (20.8 to 35.6)	14.8 (9.0 to 20.6)	13.4 (4.0 to 22.8)	1.90 (1.19 to 3.06)
30-d mortality
Current use	7.1 (4.9 to 9.3)	6.9 (4.7 to 9.1)	0.2 (–2.9 to 3.3)	1.03 (0.66 to 1.60)
Incident use	7.1 (0.4 to 13.9)	7.1 (0.4 to 13.9)	0.0 (–9.5 to 9.5)	1.00 (0.26 to 3.80)
Long-term use	7.0 (2.8 to 11.3)	4.9 (1.4 to 8.5)	2.1 (–3.4 to 7.6)	1.43 (0.56 to 3.65)

Abbreviation: NSAID, nonsteroidal anti-inflammatory drug.