Table 4

Variance component estimates for cord blood hormone levels

Dependent variableaEstroneTotal estradiolWeakly bound estradiolSHBG
Variance component (× 1000)b
 Subject73.0 (21.3)c36.2 (11.0)39.1 (11.8)19.8 (5.8)
 Batch5.0 (7.2)5.3 (7.9)3.2 (4.8)0.08 (0.16)
 Error1.6 (0.45)3.8 (1.1)3.7 (1.1)0.52 (0.15)
 Total79.645.346.020.4
% total variance
 Subject (= ICC)91.8 (8.6)d80.0 (14.9)85.1 (9.9)97.1 (1.3)
 Batch6.211.86.90.4
 Error2.08.38.02.5
  • a Log-transformed (base 10) values were used for the analysis. Units of compounds measured were ng/dl for estrone, total estradiol, and weakly bound estradiol and nmol/l for SHBG.

  • b Values shown are the estimates ×1000 for easier reading.

  • c Standard error (× 1000) of the variance component estimate in parentheses.

  • d SE of the ICC estimate in parentheses.