Sedentary: Sedentary Physical Activity Summary

In YukunZhang/PAactivPAL1.0: Summarize Daily Physical Activity from 'activPAL' Accelerometer Data

Description

Summarize sedentary features using proportions and percentiles

Usage

Sedentary(final_dat, bed_time, takeoff_time)

Arguments

final_dat	Raw event file, will be cleaned in this function. Event file is required for this function.
bed_time	Sleep and wake up time log, reported by participants. Log is not required for this function.
takeoff_time	Take on and off time log, reported by participants. Log is not required for this function.

Details

Proportions of sedentary bout greater than 20/60/120 minutes is the ratio of the number of sedentary bouts greater than 20/60/120 minutes to the total number of sedentary recordings.

Total sedentary time greater than 20/60/120 minutes is the summation of the sedentary durations which are greater than 20/60/120 minutes.

To calculate 5%/25%/75%/95% percentile of sedentary time, all of the recorded sedentary durations are listed and R function quantile is used to find the percentiles.

alpha_sed is defined by 1+1/M, where M is the average of log(sedentary bout length /minimum sedentary bout length).

Proportions of sedentary time between 6:00-12:00/12:00-18:00/18:00-22:00 is the ratio of the sedentary durations to the total activity durations between 6:00-12:00/12:00-18:00/18:00-22:00.

Value

Year The calendar year of recorded event

Month The calendar month of recorded event

Day The calendar day of recorded event

Dayofweek The day of that week

Weekday_or_weekend The recored event date is a weekday or weekend (0 for weekday, 1 for weekend)

break_per_day Number of interrupting sedentary behavior during the given period of time

break_rate Rate of interrupting sedentary behavior

mean_sed_bout_length Mean sedentary bout length. It is the average of the duration time for all sedentary activities

prop_of_sed_time_greater_20min Proportions of sedentary bout greater than 20 minutes

prop_of_sed_time_greater_60min Proportions of sedentary bout greater than 60 minutes

prop_of_sed_time_greater_120min Proportions of sedentary bout greater than 120 minutes

total_sed_time_greater_20min Total sedentary time greater than 20 minutes

total_sed_time_greater_60min Total sedentary time greater than 60 minutes

total_sed_time_greater_120min Total sedentary time greater than 120 minutes

percentile_sed_time_5 5% Percentile of sedentary time

percentile_sed_time_25 25% Percentile of sedentary time

percentile_sed_time_50 50% Percentile of sedentary time

percentile_sed_time_75 75% Percentile of sedentary time

percentile_sed_time_95 95% Percentile of sedentary time

alpha_sed alpha of sedentary time, see details

prop_sed_time_6_12 Proportions of sedentary time between 6:00-12:00

prop_sed_time_12_18 Proportions of sedentary time between 12:00-18:00

prop_sed_time_18_22 Proportions of sedentary time between 18:00-22:00

sed_time_in_30_and_60 Minutes Spent in Sitting/Lying Bouts (at least 30 and less 60 minutes in duration)

sed_num_in_30_and_60 Number of in Sitting/Lying Bouts (at least 30 and less 60 minutes in duration)

Examples

r2=Sedentary(sample_event,sample_bed_time,sample_takeon_log)
summary(r2)

YukunZhang/PAactivPAL1.0 documentation built on May 10, 2019, 1:12 a.m.