A dataset containing minute level wear non-wear flags for the NHANES 2003-2004 accelerometry data. The dimension and format of this dataset is the same as PAXINTEN_C except instead of reporting activity counts in the MIN1-MIN1440 columns, we provide a wear/non-wear flag indicator. These wear/non-wear flags were calculated by applying the algorithm described in Troiano et. al (2008) <doi:10.1249/mss.0b013e31815a51b3>.

Source: R/data.R

A dataset containing minute level wear non-wear flags for the NHANES 2003-2004 accelerometry data. The dimension and format of this dataset is the same as PAXINTEN_C except instead of reporting activity counts in the MIN1-MIN1440 columns, we provide a wear/non-wear flag indicator. These wear/non-wear flags were calculated by applying the algorithm described in Troiano et. al (2008) <doi:10.1249/mss.0b013e31815a51b3>.

Flags_C

Format

A data frame with 50232 rows and 1445 variables. There are 7 rows per unqiue subject identifier (SEQN). Rows are ordered descending temporally within subjects (i.e. row 1 is the first day of data for the first participant, row 2 is the following calendar day, etc.).

  • SEQN: Unique subject identifier

  • PAXCAL: Device calibration. Was the device calibrated when it was returned by the participant? 1 = Yes, 2 = No, 9 = Don't Know. Any individuals with either 2 or 9 in this variable should be examined carefully before being included in any analysis.

  • PAXSTAT: Data reliability status flag. 1 = Data deemed reliable, 2 = Data reliability is questioable. Any individuals with 2 in this variable should be examined carefully before being included in any analysis.

  • WEEKDAY: Day of the week: 1 = Sunday, 2 = Monday, 3 = Tuesday, 4 = Wednesday, 5 = Thursday, 6 = Friday, 7 = Saturday.

  • SDDSRVYR: Variable indicating which wave of the NHANES study this data is associated with. For example, SDDSRVYR = 3 corresponds to the 2003-2004 wave and SDDSRVYR = 4 corresponds to the 2005-2006 wave.

  • MIN1-MIN1440: Wear/Non-wear flag corresponding to each minute of the day. These columns can take on the following 3 values

    • 0: A value of 0 indicates that a particular minute is determined to be "non-wear"

    • 1: A value of 1 indicated that a particular minute is determined to be "wear"

    • NA: A value of NA indicates that a particular minute was missing data in the activity count data matrix used to create this set of wear/non-wear flags

    For example, a value of 0 in the column MIN1 indicates that during the time period 00:00-00:01, it was estimated that the device was not worn.