Table 1. Characteristics of mothers and infants in groups with different PCDDs/Fs-TEQ levels.
| Percentile of PCDDs/Fs-TEQ (pg/gfat) | <25 | 25–50 | 50–75 | ≥75 | Total | ||||||||||||
| Number of subjects | 52 | 53 | 52 | 53 | 210 | ||||||||||||
| Subject | Characteristicfactor | Unit | Mean | SD | Mean | SD | p | Mean | SD | p | Mean | SD | p | Mean | SD | Min. | Max. |
| Mothers | Residency | years | 12.7 | 10.6 | 19.7 | 10.8 | a | 21.0 | 12.5 | a | 23.6 | 10.4 | a | 19.2 | 11.7 | 1 | 43 |
| Age | years | 26.1 | 4.6 | 26.4 | 5.5 | 28.6 | 6.5 | 30.8 | 6.0 | a,b | 28.0 | 6.0 | 16 | 43 | |||
| Parity(rate of primipara) | % | 21.2 | 32.1 | 36.5 | 28.3 | 29.5 | |||||||||||
| Education | years | 8.6 | 3.1 | 8.8 | 3.8 | 8.8 | 3.4 | 8.2 | 3.7 | 8.6 | 3.5 | 0 | 17 | ||||
| Income | x1000D/mon | 3049 | 1990 | 2918 | 1372 | 2997 | 1473 | 2887 | 1577 | 2962 | 1608 | 500 | 10000 | ||||
| Alcohol drinking(yes/no) | % | 23.1 | 20.8 | 17.3 | 7.5 | 17.1 | |||||||||||
| Family smoking(yes/no) | % | 80.8 | 84.9 | 84.6 | 77.4 | 81.9 | |||||||||||
| Weight before delivery | kg | 56.6 | 7.2 | 58.7 | 7.2 | 58.9 | 6.4 | 56.7 | 6.6 | 57.7 | 6.9 | 41 | 75 | ||||
| Height | cm | 152.9 | 4.5 | 154.9 | 5.6 | 154.6 | 4.9 | 153.6 | 5.0 | 154.0 | 5.0 | 141 | 176 | ||||
| Infants | Gestational period | weeks | 39.5 | 0.8 | 39.7 | 0.8 | 39.4 | 0.7 | 39.6 | 0.9 | 39.5 | 0.8 | 37 | 42 | |||
| Gender(rate of boys) | % | 57.7 | 69.8 | 53.8 | 47.2 | 57.1 | |||||||||||
| Low birth weight<2500g | % | 0.0 | 0.0 | 0.0 | 1.9 | 0.5 | |||||||||||
| Breast milk* | 2,3,7,8-TetraCDD | pg/gfat | 0.70 | 2.01 | 1.24 | 1.81 | a | 1.82 | 1.70 | a,b | 2.83 | 1.82 | a,b,c | 1.46 | 2.21 | 0.13 | 9.98 |
| TEQ% | % | 12.2 | 7.8 | 12.4 | 5.9 | 13.4 | 6.3 | 14.1 | 7.1 | 13.1 | 6.8 | 1.1 | 53.7 | ||||
| PCDDs-TEQ | pg-TEQ/gfat | 3.80 | 1.35 | 6.63 | 1.16 | a | 8.58 | 1.15 | a,b | 12.92 | 1.34 | a,b,c | 7.28 | 1.65 | 1.90 | 39.39 | |
| PCDFs-TEQ | pg-TEQ/gfat | 3.66 | 1.37 | 5.95 | 1.17 | a | 8.25 | 1.15 | a,b | 11.93 | 1.28 | a,b,c | 6.82 | 1.63 | 1.81 | 32.94 | |
| PCDDs/Fs-TEQ | pg-TEQ/gfat | 7.53 | 1.31 | 12.66 | 1.10 | a | 16.93 | 1.09 | a,b | 25.09 | 1.26 | a,b,c | 14.22 | 1.61 | 3.73 | 72.34 | |
a: p<0.01 as compared with <25percentile group, b: p<0.01 as compared with 25-50 percentile group, c: p<0.01 as compared with 50-75 percentile group (tested by Scheffe test).
SD: standard deviation, p: p-value, Min.: minimum, Max.: maximum, x1000D/mon: 1000 Vietnamese Dong per month, TEQ: toxic equivalent.
*
: geometrical mean and geometrical standard deviation.