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Table 1 Characteristics of the study groups in two districts of eastern Slovakia, 2002-2004.

From: Neurodevelopmental toxicity of prenatal polychlorinated biphenyls (PCBs) by chemical structure and activity: a birth cohort study

Characteristics Mother (N = 760) Cord (N = 258)
  % (n) % (n)
  Total Michalovce Svidnik Total Michalovce Svidnik
  (n = 760) 73.5(559) 26.5(201) (n = 258) 70.2(181) 29.8(77)
Maternal age       
   < 19 2.6 (20) 2.6 (15) 2.5 (5) 2.3 (6) 2.8(5) 1.3(1)
   < 29 70.0(532) 71.6 (400) 65.7(132) 70.2 (181) 71.8(130) 66.2(51)
   29 + 27.4(208) 25.8 (144) 31.8 (64) 27.5 (71) 25.4 (46) 32.5(25)
Maternal education       
   Basic schooling 18.4 (140) 21.3(119) 10.5(21) 18.2 (47) 21.5 (39) 10.4 (8)
   High school without graduation 27.4 (208) 27.4(153) 27.4(55) 26.0 (67) 26.5 (48) 26.7 (19)
   High school with graduation 46.7 (355) 45.3(253) 50.8(102) 48.8(126) 45.9 (83) 55.8 (43)
   More than College/University 7.0 (53) 5.5(31) 10.9(22) 6.6 (17) 5.5 (10) 9.1 (7)
   Missing 0.5 (4) 0.5(3) 0.5(1) 0.4 (1) 0.6(1) -
Sex of child       
   Male 51.3 (390) 51.3 (287) 51.2(103) 47.3(122) 49.7 (90) 41.6 (32)
   Female 48.7 (370) 48.7(272) 48.8(98) 52.7(136) 50.3 (91) 58.4 (45)
Ethnicity       
   Slovakian/other eastern European 79.2 (602) 77.3(432) 84.6(170) 79.8 (206) 77.6(140) 85.7 (66)
   Romani 18.6 (141) 19.7(110) 15.4(31) 17.1 (44) 18.2 (33) 14.3 (11)
   Missing 2.2 (17) 3.0(17) - 3.1 (8) 4.4 (8) -
Marital status       
   Married or living with partner 91.6 (696) 90.0(503) 96.0(193) 91.4 (236) 89.5 (162) 96.1 (74)
   Never married 5.5 (42) 6.1(34) 4.0(8) 4.7 (12) 5.5 (10) 2.6 (2)
   Divorced/widowed 2.4 (18) 3.2(18) - 2.7 (7) 3.3 (6) 1.3 (1)
   Missing 0.5 (4) 0.7(4) - 1.2 (3) 1.7(3) -
Maternal smoking       
   No 62.8 (477) 61.4 (343) 66.7(134) 61.2 (158) 56.9 (103) 71.4 (55)
   Yes 34.8 (265) 35.6 (199) 32.8 (66) 35.7 (92) 38.7(70) 28.6 (22)
   Missing 2.4 (18) 3.0 (17) 0.5 (1) 3.1 (8) 4.4 (8) -
Maternal Alcohol consumption       
   No 69.0 (525) 77.6 (434) 45.3 (91) 59.3 (153) 65.8 (119) 44.2 (34)
   Yes 28.6 (217) 19.3 (108) 54.2(109) 37.6 (97) 29.8 (54) 55.8(43)
   Missing 2.4 (18) 3.1(17) 0.5(1) 3.1 (8) 4.4 (8) -
Parity       
   0 38.4 (292) 39.0(218) 36.8(74) 38.4 (99) 40.9(74) 32.5 (25)
   1 34.7 (264) 35.2(197) 33.3(67) 31.4 (81) 29.8 (54) 35.1(27)
   2 17.9 (136) 17.5(98) 18.9(38) 20.5 (53) 21.0 (38) 19.5 (15)
   3 8.6 (65) 7.7(43) 11.0(22) 8.5 (22) 6.6 (12) 13.0 (10)
   4 0.3 (2) 0.4(2) - 0.8 (2) 1.1(2) -
   Missing 0.1 (1) 0.2(2) - 0.4 (1) 0.6 (1) -
Maternal hyper- or hypothyroidism history       
   No 94.7 (720) 94.5(528) 95.5(192) 93.4 (241) 93.9 (170) 92.2 (71)
   Yes 3.1 (23) 2.5(14) 4.5 (9) 3.5 (9) 1.7 (3) 7.8(6)
   Missing 2.2 (17) 3.0 (17) - 3.1 (8) 4.4(8) -
Maternal diabetes history       
   No 96.6 (734) 95.7 (535) 99.0(199) 95.3 (246) 94.5(171) 97.4 (75)
   Yes 1.2 (9) 1.3 (7) 1.0 (2) 1.6 (4) 1.1(2) 2.6 (2)
   Missing 2.2 (17) 3.0(17) - 3.1 (8) 4.4(8) -
Raven's score       
   Mean (SD) 41.0(12.9) 40.6 (13.7) 42.2 (10.4) 40.5 (13.3) 39.4 (14.1) 43.8 (11.1)
MDI       
   Mean (SD) 93.8 (13.4) 93.1(13.5) 95.7 (13.0) 91.0(13.5) 89.7 (13.7) 94.1 (12.7)
PDI       
   Mean (SD) 99.8 (15.1) 103.1(14.3) 90.6(13.6) 98.6 15.4) 100.9 (15.5) 93.0 (13.7)