READ ME

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General information
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Author: Charles Ojobor
Contact: Kirsten Brandt
DOI: 10.25405/data.ncl.21931533
License: CC BY 4.0
Last updated: 24 January 2023
Related article: A pre-print entitled 'Carrot intake is consistently negatively associated with cancer incidence: a systematic review and meta-analysis of prospective observational studies': https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4316849

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Introductory information
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Files included in the data deposit (include a short description of what data are contained): 

1)'STUDY COMPREHENSIVE DATA ENTRY SHEET', it contains all the data extracted from each publication.
2)'FULL DATASET ANALYSED' shows the data that were selected for each analysis and some of the subgroup analyses.
3)


Explain the relationship between multiple data sets, if required:
Background data for the meta-analysis described in the pre-print entitled 'Carrot intake is consistently negatively associated with cancer incidence: a systematic review and meta-analysis of prospective observational studies'. 
These files contain the data used in the meta-analysis, which corresponds to the pre-print and subsequent published versions. 
Updated versions of the files correspond to changes during the review and editing process. 
One file is the initally extracted data, called 'STUDY COMPREHENSIVE DATA ENTRY SHEET', it contains all the data extracted from each publication.
The other file, called 'FULL DATASET ANALYSED' shows the data that were selected for each analysis and some of the subgroup analyses. In some cases, the total number of data points were different for a subgroup analysis than for the main analysis; this reflected situations where some studies were stratified, e.g. reporting different types of cancer, but representing only one geographical region.
These files supplement the publication and its supplementary data file (also included in the pre-print version) to provide all the relevant data for this study.



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Methodological information
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A brief method description – what the data is, how and why it was collected or created, and how it was processed:

Method description is in the publication, including the pre-print: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4316849

Instruments, hardware and software used: 

Method description is in the publication, including the pre-print: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4316849

Date(s) of data collection: 

The systematic review included studies published from inception of the databases until June 2022.

Geographic coverage of data:

Worldwide (in as far as data were available)

Data validation (how was the data checked, proofed and cleaned):

Method description is in the publication, including the pre-print: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4316849

Overview of secondary data, if used:

The data are all secondary data

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Data-specific information
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Definitions of names, labels, acronyms or specialist terminology uses for variables, records and their values: 

Method description is in the publication, including the pre-print: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4316849

Explanation of weighting and grossing variables: 

Method description is in the publication, including the pre-print: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4316849 and method references therein

Outline any missing data:

N/A