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. 2019 Mar 30;149(4):619–627. doi: 10.1093/jn/nxy316

TABLE 3.

Circulating concentrations of sex steroid hormones by COMT genotype in postmenopausal women randomly assigned to the GTE or placebo group1

COMT genotype
Sex hormone G/G (n = 248) A/A (n = 300) G/A (n = 389)
Time point GTE (n = 126) PLC (n = 122) GTE (n = 156) PLC (n = 144) GTE (n = 181) PLC (n = 208) P 2
Estrone, pg/mL 0.71
 Baseline 23.5 (21.4, 25.7) 24.1 (22.0, 26.5) 22.2 (20.3, 24.3) 22.3 (20.3, 24.5) 22.7 (20.9, 24.7) 24.4 (22.6, 26.3)
 Month 12 24.1 (21.8, 26.8) 23.5 (21.2, 26.1) 22.4 (20.6, 24.3) 21.9 (20.1, 23.9) 21.3 (19.6, 23.1) 22.3 (20.7, 24.0)
Estradiol, pg/mL 0.53
 Baseline 3.3 (2.7, 4.0) 3.2 (2.6, 3.9) 3.5 (3.0, 4.2) 3.7 (3.1, 4.4) 3.3 (2.8, 3.9) 4.0 (3.4, 4.7)
 Month 12 4.1 (3.3, 5.0) 3.0 (2.4, 3.7) 3.4 (2.9, 4.0) 3.3 (2.8, 3.8) 3.8 (3.3, 4.4) 3.2 (2.7, 3.6)
Bioavailable estradiol, pg/mL 0.54
 Baseline 1.5 (1.2, 1.8) 1.4 (1.2, 1.8) 1.6 (1.3, 1.9) 1.6 (1.4, 2.0) 1.5 (1.2, 1.8) 1.8 (1.6, 2.2)
 Month 12 1.9 (1.5, 2.3) 1.3 (1.1, 1.7) 1.5 (1.3, 1.8) 1.5 (1.2, 1.7) 1.7 (1.5, 2.0) 1.5 (1.3, 1.7)
Androstenedione, pg/mL 0.51
 Baseline 480 (440, 523) 490 (449, 534) 484 (448, 522) 501 (462, 542) 478 (447, 511) 521 (490, 555)
 Month 12 494 (461, 530) 479 (446, 514) 453 (420, 489) 468 (432, 506) 467 (439, 496) 487 (460, 516)
Testosterone, pg/mL 0.95
 Baseline 158 (143, 174) 173 (157, 190) 147 (133, 162) 155 (140, 172) 149 (135, 164) 161 (147, 176)
 Month 12 165 (150, 181) 159 (145, 174) 152 (138, 168) 151 (136, 167) 158 (145, 172) 157 (145, 170)
Bioavailable testosterone, pg/mL 0.84
 Baseline 40.1 (36.0, 44.6) 44.4 (39.8, 49.4) 37.2 (33.3, 41.5) 39.0 (34.8, 43.8) 38.2 (34.5, 42.3) 42.4 (38.6, 46.7)
 Month 12 43.0 (39.0, 47.5) 40.4 (36.6, 44.7) 38.3 (34.4, 42.7) 38.3 (34.2, 42.8) 40.9 (37.2, 45.1) 41.9 (38.3, 45.9)
SHBG, nmol/L 0.97
 Baseline 70.2 (64.5, 76.3) 69.4 (63.7, 75.5) 68.8 (64.3, 73.6) 71.6 (66.7, 76.8) 66.8 (62.2, 71.7) 66.5 (62.3, 71.1)
 Month 12 67.9 (62.5, 73.9) 70.5 (64.8, 76.7) 71.4 (66.6, 76.5) 70.8 (65.8, 76.1) 67.7 (62.7, 73.0) 65.5 (61.1, 70.3)

1 n = 937. Values are geometric means (95% CIs). COMT, catechol-O-methyltransferase; GTE, green tea extract; PLC, placebo; SHBG, sex hormone-binding globulin.

2 P values for the interaction between treatment and COMT genotype derived from a mixed-effects repeated-measures ANOVA with adjustment for age and BMI at baseline.