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Which weight to use (rule of thumb)

• •
  If LBXTC was measured on (basically) all examined participants in that cycle:

  • • Use WTMEC2YR for a single 2-year cycle
  • • If combining cycles, you create a combined MEC weight from WTMEC2YR per NHANES guidelines (e.g., divide by number of 2-year cycles you combine, assuming you stack cycles correctly).
• •
  If LBXTC was measured only in a fasting/subsample group in that cycle:

  • • Use the fasting/subsample weight, commonly WTSAF2YR (and an analogous multi-year version if you build it).

# df is your merged NHANES dataset for a given cycle
# Columns expected: LBXTC, WTMEC2YR, (maybe WTSAF2YR)

df[["LBXTC", "WTMEC2YR", "WTSAF2YR"]].isna().mean()