Table 2.

Baseline characteristics, and the mean (standard deviation) and median (Interquartile range) number of pre- and post-letter physician claims, for control and comparison groups.

VARIABLE	Control (Group 1) N=10,370	Comparison (Groups 2–6) N=8,119	TOTAL N=18,489
Age
Mean ± SD	50.19 ± 13.7	49.65 ± 13.93	49.96 ± 13.84
Median (IQR)	49 (39–60)	48 (39–59)	49 (39–60)
Female	6,099 (58.81%)	5,080 (62.57%)	11,179 (60.46%)
Initial Serum Ferritin
Mean ± SD	134.92 ± 108.86	157.06 ± 191.16	144.64 ± 151.04
Median (IQR)	100 (54–184)	91 (37–201)	97 (47–190)
Pre-results physician claims*
Total:
Mean ± SD	16.41 ± 14.87	17.43 ± 15.81	16.86 ± 15.30
Median (IQR)	12 (7–21)	13 (8–22)	13 (7–22)
Genetic Counselling:
Median (IQR)	0 (0–0)	0 (0–0)	0 (0–0)
Laboratory Tests:
Median (IQR)	3 (2–6)	4 (2–6)	4 (2–6)
Post-results Physician Claims*
Total:
Mean ± SD	15.09 ± 15.66	16.23 ± 17.56	15.59 ± 16.53
Median (IQR)	11 (5–20)	12 (6––21)	11 (5–20)
Genetic Counselling:
Median (IQR)	0 (0–0)	0 (0–0)	0 (0–0)
Laboratory Tests:
Median (IQR)	2 (0–5)	2 (0–5)	2 (0–5)

^*Total claims submitted by generalist and specialist physicians include office/clinic visits, laboratory tests, and genetic counseling