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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Pediatr Int. 2012 Jul 10;54(5):669–675. doi: 10.1111/j.1442-200X.2012.03648.x

Table 1.

Descriptive Statistics and Chi-squared Correlation among Measured Key Variables

Variablea (Mean, SD) X2
Hb Level VIQ PIQ Male Gender Serum Fe Level Social Adversity
Hb Levelb (12.68, 0.87) 1 0.139* 0.080* 0.032 0.101 0.071
VIQc (103.08, 12.49) --- 1 0.301* −0.011 0.004 −0.271*
PIQc (107.10, 13.78) --- --- 1 0.081 −0.022 −0.089
Male Genderd (0.43, 0.50) --- --- --- 1 0.092 0.03
Serum Fe Levele (7.99, 0.80) --- --- --- --- 1 −0.035
Social Adversityf (3.08, 2.04) --- --- --- --- --- 1
a

Includes only the 145 subjects who have complete data for all variables

b

Measured at Age 4 in g/dL

c

Measured at Age 6

d

Male = 1, Female = 0

e

Measured at Age 4 in μg/dL

f

Measured at Age 4; Range=0–11; 11 = greatest severity

*

Significant at two-tailed α=0.10