es_from_rr_ci {metaConvert}

Convert a risk ratio value and 95% confidence interval to three effect measures (SMD, OR, COR)

Description

Convert a risk ratio value and 95% confidence interval to three effect measures (SMD, OR, COR)

Usage

es_from_rr_ci(
  rr,
  rr_ci_lo,
  rr_ci_up,
  logrr,
  logrr_ci_lo,
  logrr_ci_up,
  baseline_risk,
  n_exp,
  n_nexp,
  n_cases,
  n_controls,
  rr_to_or = "metaumbrella",
  smd_to_cor = "viechtbauer",
  reverse_rr
)

Arguments

rr

risk ratio value

rr_ci_lo

lower bound of the 95% CI around the risk ratio value

rr_ci_up

upper bound of the 95% CI around the risk ratio value

logrr

log risk ratio value

logrr_ci_lo

lower bound of the 95% CI around the log risk ratio value

logrr_ci_up

upper bound of the 95% CI around the log risk ratio value

baseline_risk

proportion of cases in the non-exposed group (only required for the rr_to_or = "grant_CI" and rr_to_or = "grant_2x2" arguments).

n_exp

number of participants in the exposed group (only required for the rr_to_or = "grant_CI", rr_to_or = "grant_2x2" arguments).

n_nexp

number of participants in the non-exposed group (only required for the rr_to_or = "grant_CI", rr_to_or = "grant_2x2" arguments).

n_cases

number of cases/events

n_controls

number of controls/no-event

rr_to_or

formula used to convert the rr value into an odds ratio (see details).

smd_to_cor

formula used to convert the SMD value (converted from RR) into a coefficient correlation (see es_from_cohen_d).

reverse_rr

a logical value indicating whether the direction of the generated effect sizes should be flipped.

Details

This function uses the 95% CI of the (log) risk ratio to obtain the standard error (Section 6.5.2.2 in the Cochrane Handbook).

logrr\_se = \frac{\log{rr\_ci\_up} - \log{rr\_ci\_lo}}{2 * qnorm(.975)}

Then, calculations of the es_from_rr_se() are applied.

Value

This function estimates and converts between several effect size measures.

natural effect size measure	RR
converted effect size measure	OR + NNT
required input data	See 'Section 3. Risk Ratio'
	https://metaconvert.org/html/input.html

References

Higgins JPT, Li T, Deeks JJ (editors). Chapter 6: Choosing effect size measures and computing estimates of effect. In: Higgins JPT, Thomas J, Chandler J, Cumpston M, Li T, Page MJ, Welch VA (editors). Cochrane Handbook for Systematic Reviews of Interventions version 6.3 (updated February 2022). Cochrane, 2022. Available from www.training.cochrane.org/handbook.

Examples

es_from_rr_ci(
  rr = 1, rr_ci_lo = 0.5, rr_ci_up = 2,
  n_cases = 42, n_controls = 38, baseline_risk = 0.08
)