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Table 3 List of variables extracted for the systematic review on GMHT crops
| Variable Name | Definition | Type | Closed terms |
|---|---|---|---|
| article_id | Unique identification number assigned to each publication | Integer | No |
| Author | Author(s) of the listed publication. | Text | No |
| Crop | Common and species name | Text | Yes |
| publication_year | Year of publication of study | Integer | No |
| citation | Citation, e.g. journal name, volume and page numbers | Text | No |
| title | Title of the publication | Text | No |
| author_affiliation | Type(s) of institutions/organisations that the author(s) are affiliated with | Text | Yes |
| author_institute | Institution of corresponding author (or of first author if no corresponding author was listed). | Text | No |
| funding | Funding source | Text | No |
| peer_reviewed | Indicates whether study was published in a peer reviewed journal. | string | yes |
| Location | Geoposition or region/country where field study was performed | string | yes |
| Site_info | Information on previous cropping, rotation, soil type, irrigation etc. | string | yes |
| expmt_num | Number of experiments within a study (e.g. different locations, years, etc.) | string | no |
| data_location | Figure number, table number or page number where means and variation were found. | string | no |
| was_data_scanned | Indicates whether figures were scanned to obtain data values. | YesNo | yes |
| GM trait | Herbicide tolerance gene engineered into the transgenic crop. | string | yes |
| Conv. herb | Conventional herbicide comparator treatment | string | yes |
| event | Transgenic event of the crop tested. | string | no |
| transgenic_hybrid_or_var | Transgenic hybrid or variety name. | string | no |
| nontransgenic _var | Non-transgenic comparator variety name. | string | no |
| Weed/plant_class | taxonomic class | string | yes |
| Weed/plant_sub class | Monocotyledon or dicotyledon | string | yes |
| plant_order | taxonomic order | string | yes |
| plant_family | taxonomic family | string | yes |
| plant_genus | taxonomic genus | string | yes |
| plant_species | taxonomic species | string | yes |
| plant_finest grouping | Finest level of taxonomic resolution reported for the plant(s). | string | yes |
| Annual/perennial | string | yes | |
| Strata | Emergence/establishment E= early, M= midseason, L=late | string | yes |
| replicate_data_issues | Codes flag for non-independence to be considered for analyses: TGLE=taxonomic group lumped elsewhere; EMUE= experimental means used elsewhere; CMUE=control means used elsewhere; | string | yes |
| Plant _stage | Stage. | string | yes |
| field_location | Location of field(s) to the level of specificity provided by the author | string | no |
| number_of_fields | Number of fields as described by the author. | integer | no |
| cultivation | Cultivation practices used within the fields (notes on tillage, herbicides, etc.) | string | no |
| plot_size | Size of replicate plots (in hectares) | real | no |
| plot_size_explanation | Explanations for any calculations done to obtain plot size | string | no |
| is_plot_size_avg | Indicates whether the listed plot size is an average or an estimate | string | yes |
| was_study_randomized | Indicates whether the authors indicated that they randomly assigned replicates to treatments. | string | yes |
| planting_date | Date on which field plots were planted. | string | no |
| first_sample | Date on which first sample was taken | string | no |
| last_sample | Date on which last sample was taken | string | no |
| study_duration | More detailed description on study duration | string | no |
| herbicide_name | Brand name of herbicides used. | string | yes |
| herbicide_active_ingr | Active ingredient for herbicides used. | string | yes |
| _spray_rate | Amount of active ingredient per spray. | string | no |
| mechanism_of_herbicide_app | Indicates if herbicide was applied as spray, granule, LV,ULV | string | yes |
| num_of_herbicide_app | Number of herbicide applications. | real | no |
| is_num_of_herbicide_app_avg | Indicates if the number of herbicide applications is an average | string | yes |
| sampling_method_abbrev | Abbreviated description of sampling method | string | yes |
| sampling_method_detailed | Detailed description of sampling method. | string | no |
| sampling_frequency | Frequency of repeated samples per replicate field or plot. | string | yes |
| number_of_sample_days | The number of times that each replicate field or plot was repeatedly sampled over the duration of the experiment. | real | no |
| num_subsamples | Number of subsamples per true replicate. | real | no |
| response_variable_abbrev | Major category of response variable. | string | yes |
| response_variable_detailed | Detailed description of response variable. | string | no |
| true_control_sample_size | True sample size for control treatment. | real | no |
| true_expmtl_sample_size | True sample size for experimental treatment. | real | no |
| authors_control_sample_size | Sample size for the control treatment as stated by the author. | real | no |
| authors_expmtl_sample_size | Sample size for the experimental treatment as stated by the author. | real | no |
| seasonal_or_peak | Indicates whether values represent seasonal means across multiple sample days or means from peak days | string | yes |
| did-we-calc | Indicates whether we calculated the seasonal mean or peak days. | YesNo | yes |
| calc_method_seas_mean | Explains how we calculated the seasonal mean or peak days | string | yes |
| comparison_type | Indicates whether the comparison is with conventional treated HT or conventional treated control, minimum tillage vs conventional tillage | string | yes |
| control_mean | Mean for the control treatment. | real | no |
| expmtl_mean | Mean for the experimental treatment. | real | no |
| control_std_err | Standard error for the control treatment. | real | no |
| expmtl_std_err | Standard error for the experimental treatment. | real | no |
| control_std_dev | Standard deviation for the control treatment. | real | no |
| expmtl_std_dev | Standard deviation for the experimental treatment. | real | no |
| mean_unit | Unit of measurement for the response variable. E.g. weed/seed numbers, biomass, ground cover. | string | yes |
| statistical_test_used | Statistical test used by author. | string | yes |
| is_effect_significant | Indicates whether a significant effect was detected by the author. | string | yes |
| warning1 | Space for remarks for this record | string | no |
