Table 4.

RRI classes and complications risk.

	Global population (n = 205)	Cardiothoracic subgroup (n = 122)
RRI < 0.6	1	1
RRI 0.60–0.65	OR 1.34 (95% CI 0.39–4.75); P = 0.636	OR 1.02 (95% CI 0.17–6.06); P = 0.984
RRI 0.66–0.70	OR 1.92 (95% CI 0.57–6.51); P = 0.295	OR 1.38 (95% CI 0.25–7.67); P = 0.717
RRI 0.71–0.75	OR 2.93 (95% CI 0.79–10.9); P = 0.109	OR 3.38 (95% CI 0.59–19.4); P = 0.171
RRI > 0.75	OR 3.10 (95% CI 0.85–11.3); P = 0.087	OR 2.75 (95% CI 0.47–16.0); P = 0.260

When RRI > 0.7 OR triplicates, although it did not result to be statistically significant.