Table 4.

Proposed adjustments^a to hemoglobin for smoking status and cigarettes per day

WHO adjustments (g/L)b		Proposed Hb adjustment (g/L)c
Smoker, quantity unknown	3	Smoker, quantity unknown	2
Cigarettes (packs) per day		Cigarettes per day
$<10\left(\frac{1}{2}\right)$	0	1–5	2
		6–10	4
$10-19\left(\frac{1}{2}\text{ to }1\right)$	3	11–15	5
		16–20	6
20–39 (1–2)	5	>20	7
≥40 (>2)	7

^aAdjustment is the amount added to the hemoglobin cutoff defining anemia, or subtracted from an individual’s observed hemoglobin level.

^bWHO cutoffs published as packs per day.²

^cAdjustments based on Hb adjustment (g/L) = (0.4565 × cigarette_number) + (−0.0078 × cigarette_number²), solved for the upper end of each interval (e.g., 5 for the 1−5 range). >20 solved using 30 cigarettes/day.

Note: Current WHO recommendations provided for comparison.