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 |