Dane Van Domelen

Statistician

Data dictionary

Description of variables generated by process_nhanes function in nhanesaccel package.

Variable name brevity Description
seqn 1+ Participant ID number.
nhanes_wave 1+ 1 if participant is from NHANES 2003-2004, 2 if NHANES 2005-2006.
day 1+ Day of week (1 = Sunday, …, 7 = Saturday).
valid_day 1+ 1 if day is considered valid for analysis, otherwise 0.
valid_days 1+ Number of valid days. Only included in per-person summary.
valid_week_days 1+ Number of valid weekdays. Only included in per-person summary.
valid_weekend_days 1+ Number of valid weekend days. Only included in per-person summary.
include 1+ 1 if participant is deemed to have valid data for analysis, otherwise 0.
valid_min 1+ Number of minutes classified as valid wear time.
counts 1+ Total counts accumulated during wear time minutes.
cpm 1+ counts/valid_min.
steps 2+ Total steps accumulated during weartime minutes.
sed_min 2+ Sedentary minutes, or minutes with counts < int_cuts[1].
light_min 2+ Light intensity minutes, or minutes with int.cuts[1] <= counts < int.cuts[2].
life_min 2+ Lifestyle intensity minutes, or minutes with int.cuts[2] <= counts < int.cuts[3].
mod_min 2+ Moderate intensity minutes, or minutes with int.cuts[3] <= counts < int.cuts[4].
vig_min 2+ Vigorous intensity minutes, or minutes with counts >= int.cuts[4].
lightlife_min 2+ Light-to-lifestyle intensity minutes.
mvpa_min 2+ Moderate-to-vigorous intensity minutes.
active_min 2+ Active (i.e. non-sedentary) minutes.
sed_percent 2+ sed_min/valid_min.
light_percent 2+ light_min/valid_min.
life_percent 2+ life_min/valid_min.
mod_percent 2+ mod_min/valid_min.
vig_percent 2+ vig_min/valid_min.
lightlife_percent 2+ lightlife_min/valid_min.
mvpa_percent 2+ mvpa_min/valid_min.
active_percent 2+ active_min/valid_min.
sed_counts 2+ Counts accumualted during sedentary time.
light_counts 2+ Counts accumulated during light intensity activity.
life_counts 2+ Counts accumulated during lifestyle intensity activity.
mod_counts 2+ Counts accumulated during moderate intensity activity.
vig_counts 2+ Counts accumulated during vigorous intensity activity.
lightlife_counts 2+ Counts accumulated during light-to-lifestyle intensity activity.
mvpa_counts 2+ Counts accumulated during MVPA.
active_counts 2+ Counts accumulated during active (i.e. non-sedentary) time.
sed_bouted_10min 2+ Sedentary minutes accumulated in bouts of length >= 10 min.
sed_bouted_30min 2+ Sedentary minutes accumulated in bouts of length >= 30 min.
sed_bouted_60min 2+ Sedentary minutes accumulated in bouts of length >= 60 min.
sed_breaks 2+ Number of times participant transitions from sedentary to non-sedentary minute.
max_1min_counts 2+ Maximum count value.
max_5min_counts 2+ Maximum average count value over a 5-min interval.
max_10min_counts 2+ Maximum average count value over a 10-min interval.
max_30min_counts 2+ Maximum average count value over a 30-min interval.
num_mvpa_bouts 2+ Number of MVPA bouts.
num_vig_bouts 2+ Number of vigorous bouts.
mvpa_bouted 2+ MVPA minutes accumulated in bouts of length >= active_bout_length.
vig_bouted 2+ Vigorous intensity minutes accumulated in bouts of length >= active_bout_length
guideline_min 2+ Minutes towards physical activity guidelines (150 min/wk of MVPA or 75 min/wk of VPA).
hourly_var_hour1 3 Value of hourly_var variable during hour 1 (midnight to 1 AM).
hourly_var_hour2 3 Value of hourly_var variable during hour 2.
hourly_var_hour3 3 Value of hourly_var variable during hour 3.
hourly_var_hour4 3 Value of hourly_var variable during hour 4.
hourly_var_hour5 3 Value of hourly_var variable during hour 5.
hourly_var_hour6 3 Value of hourly_var variable during hour 6.
hourly_var_hour7 3 Value of hourly_var variable during hour 7.
hourly_var_hour8 3 Value of hourly_var variable during hour 8.
hourly_var_hour9 3 Value of hourly_var variable during hour 9.
hourly_var_hour10 3 Value of hourly_var variable during hour 10.
hourly_var_hour11 3 Value of hourly_var variable during hour 11.
hourly_var_hour12 3 Value of hourly_var variable during hour 12.
hourly_var_hour13 3 Value of hourly_var variable during hour 13.
hourly_var_hour14 3 Value of hourly_var variable during hour 14.
hourly_var_hour15 3 Value of hourly_var variable during hour 15.
hourly_var_hour16 3 Value of hourly_var variable during hour 16.
hourly_var_hour17 3 Value of hourly_var variable during hour 17.
hourly_var_hour18 3 Value of hourly_var variable during hour 18.
hourly_var_hour19 3 Value of hourly_var variable during hour 19.
hourly_var_hour20 3 Value of hourly_var variable during hour 20.
hourly_var_hour21 3 Value of hourly_var variable during hour 21.
hourly_var_hour22 3 Value of hourly_var variable during hour 22.
hourly_var_hour23 3 Value of hourly_var variable during hour 23.
hourly_var_hour24 3 Value of hourly_var variable during hour 24 (11 PM to midnight).
wtmec2yr_adj 1+ Adjusted MEC weight for analyzing 1 two-year NHANES cycle (e.g. 2003-2004).
wtmec4yr_adj 1+ Adjusted MEC weight for analyzing 2 two-year NHANES cycles (e.g. 2003-2006).