All results from this CRM fell within the acceptable range (8.82–13.2 μg/L). The results of the prepared QC saliva samples were used to calculate percentage recoveries for the 10 μg/L spiked sample, corrected for the lead level present in the blank, for both the

“Fresh” SGI-1776 and “Device” QCs. For the “Fresh” QCs, recovery of 107.7% was observed. For the “device” QCs, recovery was 65.9%. Descriptive statistics of the sample cohort are provided in Table 1. The cohort comprised 105 paired blood and saliva samples. All participants were male (this was not an intentional discrimination by the authors, but due to the presence of very few female workers in the industries studied). There were 53 samples provided by smokers and 52 by non-smokers. The age range of participants was 18–65 years, with a mean age of 37 years old and a median Selleck Anti-diabetic Compound Library age of 35 years old. Forty of the individuals sampled were categorised as having “no sample history”. History category 1 (Δ = ± 1 μg/dL) included 27 samples; category 2 (Δ = ± 2 μg/dL) included 42 samples; and category 3 (Δ = ±3 μg/dL) included 44 samples. The remaining 21 samples had Δ > ± 3 μg/dL and were

classified as “fluctuating history”. Summary statistics of the lead levels observed in both the blood and in the saliva samples are presented in Table 2. There were no significant differences in blood lead values between the history categories 1–3 (mean: 5.59 μg/dL, 5.40 μg/dL and 5.91 μg/dL respectively; median: all 4.00 μg/dL). Variability was also very similar for the three categories (standard deviation: 4.16 μg/dL, 3.72 μg/dL and 4.32 μg/dL, respectively). However, the blood lead values for the “fluctuating history” category were much higher (mean: 17.62 μg/dL; median: 15.00 μg/dL). Variability was also much greater in this category (standard deviation: 11.31 μg/dL). For the saliva lead values, the MycoClean Mycoplasma Removal Kit mean and 75th percentile values are substantially lower for history category 1 than for categories 2 and 3 (mean: 19.8 μg/L, 27.8 μg/L and 29.0 μg/L, respectively; 75th percentile: 23.8 μg/L, 29.1 μg/L and 30.6 μg/L, respectively). The variability is also lower in category

1 than the other two categories (standard deviation: 14.2 μg/L, 31.9 μg/L and 32.2 μg/L respectively). However the median values do not demonstrate any significant difference (15.5 μg/L, 15.7 μg/L and 15.9 μg/L, respectively). Similarly to the results in blood, the salivary lead values for the “fluctuating history” category were much higher (mean: 66.2 μg/L; median 48.8 μg/L). Variability was also much higher (standard deviation: 66.3 μg/L) than for categories 1, 2 or 3. There were no substantial differences in the blood lead values between smokers and non-smokers. For the saliva lead values, the mean and 75th percentile values were higher (not statistically significant) in smokers than non-smokers (mean: 43.5 μg/L and 36.