Non-HDL cholesterol level

This function calculates a respondent's non-HDL cholesterol level by subtracting their HDL cholesterol level from their total cholesterol level. It first checks whether the input values LAB_CHOL (total cholesterol) and LAB_HDL (HDL cholesterol) are both less than certain thresholds (99.6 mmol/L and 9.96 mmol/L, respectively). If both conditions are met, it calculates the non-HDL cholesterol level; otherwise, it sets the non-HDL value to NA to indicate that the calculation is not applicable.

Usage

calculate_nonHDL(LAB_CHOL, LAB_HDL)

Arguments

LAB_CHOL

A numeric representing a respondent's total cholesterol level in mmol/L.

LAB_HDL

A numeric representing a respondent's HDL cholesterol level in mmol/L.

Value

A numeric representing the calculated non-HDL cholesterol level (in mmol.L) if both LAB_CHOL and LAB_HDL are below the specified thresholds; otherwise, it returns NA(b) to indicate that the calculation is not applicable.

Details

The function calculates the non-HDL cholesterol level by subtracting the HDL cholesterol level from the total cholesterol level. It first checks if both LAB_CHOL and LAB_HDL are less than the specified thresholds (99.6 mmol/L and 9.96 mmol/L, respectively). If both conditions are met and neither input is missing, the non-HDL cholesterol level is calculated. If either of the conditions is not met or if either input is missing (NA), the function returns NA(b) to indicate that the calculation is not applicable.

Examples

# Example: Respondent has total cholesterol of 50 mmol/L and HDL cholesterol of 5 mmol/L.
calculate_nonHDL(LAB_CHOL = 50, LAB_HDL = 5)
#> [1] 45
# Output: 45 (non-HDL cholesterol = total cholesterol - HDL cholesterol = 50 - 5 = 45)