TABLE 5.

Summary Variables for “Lifetime” and “Everyday” Perceived Racism and Risk of Uterine Leiomyomata, by Nativity Status

Summary Variable	No. Cases	No. Person-Years	Crude IR	Multivariable IRR (95% CI)*
US-born women
“Everyday” racism
<1.6†	422	15,751	26.6	1.00
1.6-1.9	881	27,291	32.3	1.18 (1.05-1.32)
2.0-2.5	976	30,151	32.4	1.20 (1.07-1.34)
≥2.6	920	27,163	33.9	1.31 (1.17-1.47)
Test for ordinal trend				P < 0.001
“Lifetime” racism
No to all†	922	32,446	28.4	1.00
Yes to 1	1077	35,072	30.7	1.06 (0.97-1.16)
Yes to 2	825	23,001	35.9	1.22 (1.11-1.34)
Yes to all 3	375	9836	38.1	1.28 (1.13-1.44)
Test for ordinal trend				P < 0.001
Foreign-born women
“Everyday” racism
<1.6†	47	1291	36.4	1.00
1.6-1.9	65	1804	36.0	0.99 (0.68-1.46)
2.0-2.5	64	1693	37.8	1.11 (0.75-1.64)
≥2.6	48	1485	32.3	0.96 (0.63-1.46)
Test for ordinal trend				P = 0.98
“Lifetime” racism
No to all†	90	2406	37.4	1.00
Yes to 1	78	2092	37.3	0.95 (0.69-1.30)
Yes to 2	39	1265	30.8	0.76 (0.51-1.12)
Yes to all 3	17	510	33.4	0.82 (0.49-1.39)
Test for ordinal trend				P = 0.18

Tests for nativity interaction (ordinal racism variable): “everyday” racism (P = 0.21) and “lifetime” racism (P = 0.008).

^*Adjusted for age, time period, parity, age at menarche, BMI, alcohol, smoking, age at first birth, years since last birth, oral contraceptive use, education, marital status, income, occupation, and geographic region.

^†Reference group.

IR indicates incidence rate per 1000 person-years; CI, confidence interval.