Miscarriage Incidence of the Subjects.

<p>Note: CI, cumulative incidence; ID, incidence density; PY, person year*, tested by chi-square, p<0.05.</p

Association between Miscarriage and Exposure to Risk Factors.

<p>Note: β, regression coefficient; SE, standard error; exposure to 50 Hz MF in the Cox regression is the measured values at the front door or in the alley in front of the subjects’ houses. Multivariate analysis was conducted using Cox regression analysis; <b>^<i>a</i></b>, the front door MF exposure was retained in the model.</p

Pregnancy of Candidate Subjects (N, %).

<p>Note: y, years of observation</p

50 Hz Magnetic Fields at Residence of Subjects (B, µT).

<p>50 Hz Magnetic Fields at Residence of Subjects (B, µT).</p

Classification of the Exposed Women and the Controls (N).

<p>Classification of the Exposed Women and the Controls (N).</p

Socio-demographic characteristics of participants [n (%)].

a)<p>Dada may not sum up to n = 206 in School A due to non-response.</p>c)<p>Dada may not sum up to n = 221 in School B due to non-response.</p>b)<p>and^d) Dada sum up to 100% due to calculation not included non-response.</p>e)<p>A chi-square test or Fisher’s exact test was used to compare categorical variables.</p><p>^f)Monthly income per capita.</p

Socio-demographic characteristics of participants (Mean ± SD).

<p>^a)One-way analysis of variance was used for continuous variables; BMI = body mass index.</p

Power frequency electric field measurements (V/m).

#<p>Reference limit came from the Technical Regulations on Environmental Impact Assessment of Electromagnetic Radiation Produced by 500 kV Ultrahigh Voltage Transmission and Transfer Power Engineering (HJ/T24-1998) in China.</p>**<p>Two-Independent Samples Nonparametric Test, Z = 3.981, p<0.001.</p><p>N = number of spot measurements; M = median = P₅₀; IR = interquartile range = P₇₅–P₂₅.</p

ANOVA results from computerized neurobehavioral testing.

a)<p>4 different ANOVAS were done considering NAI scores of VRT, DSB, VSRT and PAT as dependent variables.</p>*<p>Compared with students in School A, P<0.05.</p><p>VRT = visual retention test; DSB = digit symbol; VSRT = visual simple reaction time; PAT = pursuit aiming test.</p

Summary of results from multiple linear regression models.

a)<p>Independent variables included exposure status(0 = school A, 1 = school B), age(years), years of education(years), familiarity with computer games (0 = little to none, 1 = much), sex(0 = male, 1 = female), length of residency(years), body mass index(BMI), second-hand smoking (0 = no,1 = yes), sleep status(0 = bad, 1 = not bad, 2 = good), household fuel (0 = coal, 1 = liquified petroleum gas, 2 = electricity, 3 = others), high-tension lines surrounding residence (0 = no,1 = yes) and frequent use of household appliances(0 = no,1 = yes).</p>b)<p>4 different multiple linear regression models were done considering NAI scores of VRT, DSB, VSRT and PAT as dependent variables. Backward selection for independent variable was used in the model with the entry significance level set to 0.05 and a removal level of 0.10.</p>#<p>Independent variable reserved in the model was with a p-value <0.05;</p>*<p>Independent variable reserved in the model was with a p-value <0.001.</p><p>Beta = standardized coefficients; VRT = visual retention test; DSB = digit symbol; VSRT = visual simple reaction time; PAT = pursuit aiming test.</p