Table 2 List of variables to be extracted from the papers for the systematic review
Variable name | Definition | Type |
|---|---|---|
Georeference, longitude | GPS coordinate WGS 84 decimal format | decimal |
Georeference, latitude | GPS coordinate WGS 84 decimal format | decimal |
Location | Location of the experimental site | characters |
Crop | Name of the crop | characters |
GM Event | Name of the GM event | characters |
Treatment property | Type of Bt toxin or comparator | characters |
Gene stacking | Information about stacked event (0 - no, 1- yes), name of the stacked gene | vector {Binary integer, characters} |
Variety | The commercial name of the variety | characters |
Comparator properties | Information about the used comparator in relation with the Bt variety - isogenic or other. | characters |
Insecticide treatment | Information about insecticide treatment (0 - no, 1- yes), the product name, active substance, amount, number, time and method for application. | vector {Binary integer, characters, characters} |
Experimental design | RBC = Randomized complete blocks; CR = Completely randomized; Multi location = ML | characters |
Plot size | Calculation of the plot size (in square meters) | real number |
Plots number | Number of plots per treatment | real number |
Cropping system | Conventional; Reduced tillage; Conservation tillage etc. | characters |
Crop rotation | Information about the history of the experimental field | characters |
Tillage date | Date since last tillage event, including ploughing, harrowing, rotovation etc. | date |
Date of cropping system establishment | Date when the Bt crop was planted for first time | date |
Seeding date | Date of seeding within each growing season | date |
Sampling date | Date when the sampling was performed | date |
Order | Name of the taxonomic order of the soil invertebrates | characters |
Family | Name of the taxonomic family of the soil invertebrates | characters |
Species | Name of the taxonomic species of the soil invertebrates | characters |
Stage of development | Stage of development of the soil invertebrates | characters |
Sample type | e.g. litterbags, bulk soil, rhizosphere | characters |
Sample depth | Depth in the soil where the sample was taken | real number |
Sample amount | Amount of soil in one sample | real number |
Sampling location | Location from which the samples are take, e.g. between rows, within rows, distance from roots | characters |
Extraction method | Used technique for extraction of soil invertebrates form the sample | characters |
Sample size | Sample size as reported by the author | real number |
Measurement endpoint | Type of measured endpoint, e.g. abundance, biomass | characters |
Unit | Unit in which the measurement endpoint is presented | characters |
Value | Value of the measured endpoint | real number |
Variability measure | STD; SEM; CLM; Variance | characters |
Quantity | Quantified variability | real number |
Soil type | Soil type according to WRB classification | characters |
Other fixed and random effects | E.g. fertilization, fungicide use, additional factors and effects of the experimental design | characters |
Data origin | Table or figure from which the data originates | characters |
Data extraction | How data was extracted, e.g. as exact number from tables or scaled numbers from graphs | characters |
Statistical analysis | Description of the statistical methods for analysis of variance | characters |
Reference | Bibliographic reference code as found in the GRACE CADIMA database (Central Access Database for Impact Assessment of Crop Genetic Improvement Technologies) | characters |
Source of funding | Description of the funding source of the study | characters |
Authors affiliation | Type of institution to which the first author belongs | characters |
Comments | Any other information which may be relevant | characters |
Keywords | Keywords for finding the reference in a systematic review - {list of keywords} | characters |