Table 1. Characteristics of study participants (n=1954), by tea intake in the first and third trimesters, MIREC, Canada, 2009–2012.
|
Prevalence tea drinkers, n (%) |
|||||||
|---|---|---|---|---|---|---|---|
|
Regular |
Green |
Herbal |
|||||
| N (%) | First trimester | Third trimester | First trimester | Third trimester | First trimester | Third trimester | |
| Overall | 1954 | 290 (14.8) | 280 (14.8) | 118 (6.0) | 83 (4.4)a | 69 (3.5) | 56 (2.9) |
| Maternal age (years) | |||||||
| ⩽29 | 592 (30.3) | 94 (15.9) | 70 (11.8) | 35 (5.9) | 22 (3.7) | 12 (2.0)b | 14 (2.4) |
| 30–34 | 699 (35.8) | 94 (13.5) | 109 (15.6) | 37 (5.3) | 37 (5.3) | 19 (2.7) | 22 (3.2) |
| ⩾35 | 663 (33.9) | 102 (15.4) | 108 (16.3) | 46 (6.9) | 30 (4.5) | 38 (5.7)c | 20 (3.0) |
| Maternal country of birth | |||||||
| Canada | 1590 (81.4) | 231 (14.5) | 230 (14.5) | 79 (5.0)b | 58 (3.7)b | 53 (3.3) | 45 (2.8) |
| Other | 364 (18.6) | 59 (16.2) | 57 (15.7) | 39 (10.7)c | 31 (8.5)c | 16 (4.4) | 11 (3.0) |
| First pregnancy | |||||||
| No | 561 (28.7) | 75 (13.4) | 84 (15.0) | 34 (6.1) | 23 (4.1) | 22 (3.9) | 14 (2.5) |
| Yes | 1393 (71.3) | 215 (15.4) | 203 (14.6) | 84 (6.0) | 66 (4.7) | 47 (3.4) | 42 (3.0) |
| Marital status | |||||||
| Single, divorced or widowed | 91 (4.7) | 17 (18.7) | 10 (11.0) | 6 (6.6) | 2 (2.2) | 3 (3.3) | 1 (1.1) |
| Married or common law | 1863 (95.3) | 273 (14.7) | 277 (14.9) | 112 (6.0) | 87 (4.7) | 66 (3.5) | 55 (3.0) |
| Maternal education | |||||||
| College educated or less | 735 (37.6) | 111 (15.1) | 100 (13.6) | 41 (5.6) | 30 (4.1) | 21 (2.9) | 12 (1.6)b |
| Completed university | 716 (36.6) | 98 (13.7) | 101 (14.1) | 39 (5.5) | 29 (4.1) | 26 (3.6) | 17 (2.4) |
| Graduate university | 503 (25.7) | 81 (16.1) | 86 (17.1) | 38 (7.8) | 30 (6.0) | 22 (4.4) | 27 (5.4)c |
| Household income ($) | |||||||
| ⩽50,000 | 338 (18.1) | 56 (16.6) | 42 (12.4) | 20 (5.9) | 22 (6.5) | 10 (3.0) | 9 (2.7) |
| 50,001–100,000 | 778 (41.8) | 117 (15.0) | 117 (15.0) | 52 (6.7) | 33 (4.2) | 26 (3.3) | 21 (2.7) |
| >100,000 | 747 (40.1) | 104 (13.9) | 119 (15.9) | 43 (5.8) | 34 (4.6) | 31 (4.2) | 25 (3.4) |
| Maternal pre-pregnancy body mass index | |||||||
| <25 | 1150 (63.5) | 183 (15.9) | 171 (14.9) | 75 (6.5) | 70 (6.1)b | 46 (4.0) | 40 (3.5) |
| 25–29.9 | 396 (21.9) | 50 (12.6) | 62 (15.7) | 26 (6.6) | 8 (2.0)c | 12 (3.0) | 7 (1.8) |
| ⩾30 | 265 (14.6) | 42 (15.9) | 41 (15.5) | 11 (4.2) | 7 (2.6)c | 5 (1.9) | 5 (1.9) |
| Smoking during pregnancy | |||||||
| Daily or occasionally | 80 (4.2) | 20 (17.7) | 14 (12.4) | 4 (3.5) | 6 (7.5) | 3 (2.7) | 2 (2.5) |
| Never | 1818 (95.8) | 270 (14.7) | 274 (14.8) | 114 (6.2) | 83 (4.4) | 66 (3.6) | 54 (2.9) |
| Exposure to second hand smoke | |||||||
| Yes | 884 (45.2) | 136 (15.4) | 143 (16.2) | 74 (6.9) | 34 (3.9) | 33 (3.7) | 20 (3.4) |
| No | 1070 (54.8) | 154 (14.4) | 144 (13.5) | 44 (5.0) | 55 (5.1) | 36 (3.4) | 36 (2.3) |
| Alcohol during pregnancy | |||||||
| Never or <1/week | 1890 (96.7) | 280 (14.8) | 279 (14.8) | 112 (5.9) | 86 (4.6) | 65 (3.4) | 54 (2.9) |
| ⩾1/week | 64 (3.3) | 10 (15.6) | 8 (12.5) | 6 (9.4) | 3 (4.7) | 4 (6.3) | 2 (3.1) |
Abbreviations: BMI, body mass index; MIREC, Maternal-Infant Research on Environmental Chemicals. Missing data not shown, 7.3% of sample for maternal pre-pregnancy BMI.
a
Significantly different from tea intake at the first trimester visit, McNemar test (P<0.05).
b
Reference.
c
Significantly different from reference (P<0.05).