Table 3

Daily median (P25, P75) black tea (ml/day) and black tea polyphenols (mg/day) intake as estimated by the ATQ administered twice

Daily intake for consumer of product Median (P25, P75)a
Black teaATQ1ATQ2rpbric
Overall tea intake (ml/day)35.52 (11.83, 132.64)67.59 (21.69, 232.34)0.680.55
 Total flavonoids (mg/day)8.52 (2.91, 32.98)11.21 (4.60, 44.17)0.770.72
 Total polyphenols (mg/day)13.04 (4.49, 50.56)17.24 (7.08, 67.87)0.770.72
 Catechins (mg/day)0.94 (0.24, 4.36)1.12 (0.51, 5.34)0.820.67
 Theaflavins (mg/day)0.13 (0.04, 0.53)0.14 (0.05, 0.68)0.760.83
 Thearubigens (mg/day)7.03 (2.60, 27.25)9.59 (4.14, 35.91)0.770.73
 Gallic acid (mg/day)0.37 (0.13, 1.35)0.48 (0.22, 2.00)0.770.68
 Caffeine (mg/day)2.77 (1.03, 11.58)3.77 (1.66, 15.98)0.770.69
Hot tea (ml/day)23.45 (8.87, 81.32)25.63 (13.31, 211.21)0.670.58
 Total flavonoids (mg/day)12.32 (4.47, 75.28)13.25 (5.94, 126.26)0.720.82
 Total polyphenols (mg/day)18.95 (6.88, 115.82)20.38 (9.14, 194.26)0.720.82
 Catechins (mg/day)1.56 (0.65, 9.29)1.78 (0.83, 15.97)0.700.81
 Theaflavins (mg/day)0.15 (0.05, 0.71)0.23 (0.11, 1.37)0.760.79
 Thearubigens (mg/day)10.38 (3.77, 63.43)11.19 (5.02, 106.39)0.720.83
 Gallic acid (mg/day)0.51 (0.19, 3.04)0.51 (0.24, 5.26)0.720.82
 Caffeine (mg/day)4.64 (1.68, 2.61)4.50 (2.16, 47.54)0.720.82
Brewed iced tea (ml/day)84.49 (15.77, 84.49)116.17 (23.66, 337.94)0.710.40
 Total flavonoids (mg/day)30.50 (4.50, 57.83)29.41 (8.00, 96.38)0.790.80
 Total polyphenols (mg/day)46.86 (6.91, 88.85)45.19 (12.29, 148.08)0.790.80
 Catechins (mg/day)4.45 (0.66, 8.44)4.29 (1.17, 14.07)0.790.80
 Theaflavins (mg/day)0.48 (0.07, 0.91)0.46 (0.13, 1.52)0.790.80
 Thearubigens (mg/day)22.20 (3.27, 42.09)21.41 (5.82, 70.14)0.790.80
 Gallic acid (mg/day)1.08 (0.16, 2.05)1.04 (0.28, 3.42)0.790.80
 Caffeine (mg/day)9.50 (1.40, 18.02)9.12 (2.49, 30.03)0.790.80
Sun tea (ml/day)33.79 (11.83, 152.07)50.69 (21.69, 253.46)0.810.76
 Total flavonoids (mg/day)6.63 (2.98, 25.40)6.80 (4.53, 24.27)0.810.87
 Total polyphenols (mg/day)10.20 (4.58, 39.06)10.45 (6.97, 37.32)0.810.87
 Catechins (mg/day)0.81 (0.37, 3.12)0.83 (0.56, 2.98)0.810.87
 Theaflavins (mg/day)0.05 (0.02, 0.20)0.05 (0.04, 0.19)0.810.87
 Thearubigens (mg/day)5.77 (2.59, 22.09)5.91 (3.94, 21.10)0.810.87
 Gallic acid (mg/day)0.36 (0.16, 1.39)0.37 (0.25, 1.33)0.810.87
 Caffeine (mg/day)2.27 (1.02, 8.69)2.32 (1.55, 8.30)0.810.87
Instant iced tea (ml/day)20.70 (11.83, 184.74)121.45 (34.78, 168.97)0.640.43
 Total flavonoids (mg/day)0.68 (0.43, 8.52)4.18 (0.91, 11.71)0.79
 Total polyphenols (mg/day)1.05 (0.65, 13.04)6.40 (1.40, 17.93)0.79
 Catechins (mg/day)0.01 (0.004, 0.09)0.04 (0.01, 0.12)0.79
 Theaflavins (mg/day)0 (0, 0)0 (0, 0)
 Thearubigens (mg/day)0.68 (0.42, 8.43)4.14 (0.90, 11.59)0.79
 Gallic acid (mg/day)0.02 (0.001, 0.27)0.13 (0.03, 0.37)0.79
 Caffeine (mg/day)0.21 (0.13, 2.66)1.31 (0.29, 3.66)0.79
Restaurant iced tea (ml/day)15.77 (11.83, 50.13)26.61 (21.69, 126.73)0.530.20
 Total flavonoids (mg/day)5.56 (2.91, 17.87)7.99 (4.17, 22.34)0.670.32
 Total polyphenols (mg/day)8.56 (4.49, 27.51)12.31 (6.42, 34.41)0.670.32
 Catechins (mg/day)0.47 (0.25, 1.52)0.68 (0.36, 1.90)0.670.32
 Theaflavins (mg/day)0.04 (0.02, 0.11)0.05 (0.03, 0.14)0.670.32
 Thearubigens (mg/day)5.03 (2.63, 16.16)7.23 (3.77, 20.20)0.670.32
 Gallic acid (mg/day)0.38 (0.20, 1.22)0.54 (0.28, 1.52)0.670.32
 Caffeine (mg/day)2.37 (1.24, 7.60)3.40 (1.77, 951)0.670.32

  • a Two-sided Wilcoxon signed-rank test comparing intake (mg/day) based on ATQ2 with that based on ATQ1 = no statistical significant difference. ATQ1, first administration of the ATQ; ATQ2, second administration of the ATQ (2 months later).

  • b rp = Pearson correlation coefficient for log-transformed data.

  • c r1 = intraclass correlation coefficient for log-transformed data.