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. Author manuscript; available in PMC: 2012 Nov 6.
Published in final edited form as: J Toxicol Environ Health A. 2011;74(19):1280–1293. doi: 10.1080/15287394.2011.587106

Table 3.

Spearman rho correlation coefficients for blood lead (PbB) level and distortion product otoacoustic emissions signal-to-noise ratio (S/N) at the f2 frequencies 1187, 1500, 1906, 2406, 3031, 3812, 4812, 6031 and 7625 Hz for Pb-exposed Andean children. N = 102 ears, except at 7625 Hz where N = 45. The values for rho are corrected for ties, and the p-values are tied p-values. NS = non-significant.

Comparison Variables rho P Significance
PbB (µg/dL), S/N at f2 1187 Hz 0.168 0.091 NS
PbB (µg/dL), S/N at f2 1500 Hz 0.135 0.174 NS
PbB (µg/dL), S/N at f2 1906 Hz 0.128 0.197 NS
PbB (µg/dL), S/N at f2 2406 Hz −0.018 0.854 NS
PbB (µg/dL), S/N at f2 3031 Hz −0.112 0.259 NS
PbB (µg/dL), S/N at f2 3812 Hz −0.140 0.159 NS
PbB (µg/dL), S/N at f2 4812 Hz −0.153 0.125 NS
PbB (µg/dL), S/N at f2 6031 Hz −0.072 0.467 NS
PbB (µg/dL), S/N at f2 7625 Hz −0.211 0.162 NS