Introduction to Dose-Response Physical Activity (drpa) package

Installation from GitHub

The package is not available at CRAN. It needs to be installed from GitHub. Please use this command to install it.

remotes::install_github("meta-analyses/drpa")

You may need to install the remotes package first.

List of diseases/cause and their upper limit

The first column disease specifies the supported diseases in the package. The other three columns, which are outcome types (fatal, non-fatal and fatal-and-non-fatal), show the last knot (based on the available data points) for the specific disease. We don’t have confidence that our meta-analysis is reliable after this point, and assumes an onward flat relationship. Whenever a disease such as all-cause-cvd doesn’t have an outcome type non-fatal, it will be NA. More will follow in the next section.

disease fatal non-fatal fatal-and-non-fatal
all-cause-cancer 19.13777 NA 19.49427
all-cause-cvd 21.33552 NA 20.11288
all-cause-dementia NA 13.51200 11.41597
all-cause-mortality 12.68428 NA 12.68428
alzheimer’s-disease NA 22.36750 13.63786
bladder-cancer NA NA 13.45000
breast-cancer 15.47684 NA 26.75480
colon-cancer NA NA 20.10136
coronary-heart-disease 11.00136 NA 17.96000
depression NA 14.56452 14.56452
depressive-symptoms NA 11.75641 11.75641
diabetes NA NA 17.53800
endometrial-cancer NA NA 21.16857
esophageal-cancer NA NA 21.82207
gastric-cardia-cancer NA NA 22.52300
head-and-neck-cancer NA NA 13.59235
heart-failure NA NA 24.41750
kidney-cancer NA NA 14.81429
liver-cancer NA NA 21.82154
lung-cancer 20.20636 NA 14.17460
major-depression NA 16.54304 16.54304
myeloid-leukemia NA NA 10.06429
myeloma NA NA 21.83250
parkinson’s-disease NA 15.11423 15.17000
prostate-cancer 14.87857 NA 27.26046
rectum-cancer NA NA 18.09230
stroke 11.00400 NA 15.01652
vascular-dementia NA NA 16.85333

Setup

Load the package

library(drpa)

Get dose response relationship

Get response for dose 40 for all-cause-cvd with the default quantile 0.5 and censoring at doubling of WHO’s recommended level of physical activity for adults (17.5 MMETs hours per week).

The quantile’s value is between 0 and 1 [excluding the boundary values]


drpa::dose_response(cause = 'all-cause-cvd', outcome_type = 'fatal-and-non-fatal', dose = 40, 
                    quantile = 0.5, confidence_intervals = T, censor_method = 'WHO-DRL')
#>          rr        lb        ub
#> 1 0.6736267 0.6273602 0.7233052

Arguments

Description of the arguments are mentioned below:

Argument Description
cause All-cause-mortality or disease name
outcome_type Either one of the three possibilities for outcome type: fatal, non-fatal or fatal-and-non-fatal
dose Dose (all-cause or disease)
quantile Numeric value between 0 and 1 - default is 0.5. This captures the range of dose values between lower and upper confidence levels.
censor_method This determines whether any censor method applies to the dose-response relationship. There are three possibilities: none, 75person_years (to use 75th percentile using person years) or WHO-DRL (WHO’s recommended physical activity per week 8.75 when doubled, so 17.5 MMETs hours per week). The default value is WHO-DRL - a fixed censor point at 17.5 after which the relationship remains the same.
confidence_intervals Boolean variable to determine whether confidence intervals are returned or not - default false