Table 4 Data we will extract to allow calculation of effect sizes
From: Management of UK priority invasive alien plants: a systematic review protocol
| Data to extract | Description of data |
|---|---|
| Treatment mean | Mean value for outcome in area/time period subject to management intervention |
| Control mean | Mean value for outcome in area/time period not subject to management intervention |
| Treatment standard deviation (SD) | Standard deviation for outcome in area/time period subject to management intervention |
| Control standard deviation (SD) | Standard deviation value for outcome in area/time period not subject to management intervention |
| Treatment N | Sample size for outcome in area/time period subject to management intervention |
| Control N | Sample size in area/time period not subject to management intervention |
| Treatment standard error (SE) | Standard error for outcome in area/time period subject to management intervention |
| Control standard error (SE) | Standard error value for outcome in area/time period not subject to management intervention |
| Unit | Units used to measure outcome (e.g. %, Kg ha−1, or number of stems ha−1) |
| Least Significant Difference (LSD) | Metric allowing determination of statistical significance of a comparison between treatment mean and control mean |
| Correlation coefficient (r) | Measure of linear correlation between two variables (Pearson correlation coefficient) |
| Total N for correlation studies | Total sample size for studies that calculated the Pearson correlation coefficient |
| Approximate P value | Approximate P value where exact value of P is not given |
| Exact P value | Exact P value where it is given in the study |
| Exact Z value | Exact Z value where it is given in the study |
| Exact F value | Exact F value where it is given in the study. F values will only be taken from non-omnibus tests (i.e. not ANOVA tests) because these allow us to determine pairwise statistical significance |