Table 2.

Twelve-month Medical Care Utilization and Costs by Migraine Status^*

Outpatient, mean % visits (SD)†	Controls (n = 1,178)	Interview-ascertained Migraine Cases (n = 1,265)	Claims-diagnosed Migraine Cases (n = 147)
	90.5	92.3	99.3¶
	6.8(7.3)§	9.1(10.1)	13.4(11.7)¶
Emergency, %	17.6‡	20.7	24.5
Mean department visits (SD)†	1.8 (1.4)	1.9 (1.7)	2.2 (1.9)
Hospitalizations, %	2.8‡	4.5	8.2||
Mean admits (SD)†	1.2 (0.6)	1.3 (1.0)	1.7 (2.0)
Mean days (SD)†	5.9 (8.6)	4.3 (6.6)	5.8 (12.5)
Prescription drug, %	76.8	78.5	78.9
Mean dispensings (SD)†	13.4 (14.5)	18.3 (20.7)	26.9 (26.5)t2n6
Total costs  Mean (SD)	$2,064 ($4,176)§	$2,761 ($4,624)	$4,597 ($6,175)¶
Median	$983	$1,291	$2,691
IQ range	$381 to $2,097	$517 to $3,161	$996 to $5,381

^*GEE logistic regression models used for categorical constructs and exponential scores tests used for continuous constructs.

^†Mean among those with visit/admit/dispensing.

^‡P < .05;

^§P < .01 for pairwise comparisons between interview-ascertained migraine cases and controls.

^||P < .05;

^¶P < .01 for pairwise comparisons between undiagnosed cases (not shown) and claims-diagnosed migraine cases.

IQ range, interquartile range; SD, standard deviation.