Table 4

Geometric means (95% CI) of glycemic and inflammatory parameters by categories of Oolong tea consumption^a

never or < 1 cup per week

2-6 cups per week

≥ 1 cup(s) per day

P trend^b

Fasting plasma glucose (mmol/L)

Model-1^c

4.84 (4.82 - 4.86)

4.82 (4.77 - 4.87)

4.86 (4.81 - 4.92)

0.591

Model-2

4.75 (4.69 - 4.82)

4.75 (4.68 - 4.82)

4.76 (4.68 - 4.83)

1.000

HOMA-IR

Model-1

1.56 (1.51 - 1.60)

1.56 (1.47 - 1.65)

1.68 (1.57 - 1.79)

0.044

Model-2

1.41 (1.32 - 1.50)

1.40 (1.30 - 1.51)

1.41 (1.30 - 1.53)

0.940

HOMA-beta

Model-1

102.50 (100.2 - 104.85)

105.31 (100.28 - 110.60)

103.70 (98.02 - 109.71)

0.511

Model-2

103.83 (97.48 - 110.60)

106.22 (98.69 - 114.32)

105.89 (97.91 - 114.52)

0.428

HbA1c %

Model-1

5.78 (5.76 - 5.81)

5.76 (5.71 - 5.80)

5.81 (5.76 - 5.87)

0.461

Model-2

5.72 (5.66 - 5.78)

5.71 (5.64 - 5.78)

5.73 (5.66 - 5.81)

0.685

Adiponectin- high molecular weight (µg/ml)

Model-1

1.03 (1.00 - 1.06)

1.04 (0.97 - 1.11)

0.96 (0.89 - 1.03)

0.105

Model-2

1.01 (0.93 - 1.09)

1.04 (0.94 - 1.14)

0.99 (0.89 - 1.09)

0.829

CRP (mg/L)

Model-1

1.48 (1.41 - 1.55)

1.46 (1.32 - 1.62)

1.63 (1.45 - 1.83)

0.166

Model-2

1.29 (1.14 - 1.45)

1.30 (1.13 - 1.49)

1.35 (1.17 - 1.56)

0.397

^a HOMA-IR, homeostatic model assessment-insulin resistance; HOMA-beta, homeostatic model assessment-beta cell function; CRP, C-reactive protein. Numbers of participants differ across outcomes because participants with outlier values (response values > 4 SD from mean) were excluded. Numbers were as follows: fasting plasma glucose: 3058, 585, 431 HOMA-IR: 3087, 588, 433 HOMA-beta: 3080, 588, 427 HbA1c: 2493, 482, 378 HMW adiponectin: 3020, 572, 425 CRP: 3012, 564, 419.

^{b, c} For these footnotes please refer to Table 3

Rebello et al. Nutrition Journal 2011 10:61   doi:10.1186/1475-2891-10-61