Skip to main content

Table 2 Estimated IQ and economic cost over a 15-year period in Flanders, Belgium: Comparison of IQ decrement and economic costs attributable to blood lead levels above 20 μg/L within the Flemish population of 15 year-olds between 2000 and 2014, and from 2015 to 2029

From: Intelligence gain and social cost savings attributable to environmental lead exposure reduction strategies since the year 2000 in Flanders, Belgium

Dose response relationshipTime spanNumber of 15 year-olds in study periodProportion population B-Pb > = 20 μg/L (%)Number of 15 year-olds with B-Pb > = 20 μg/LAverage IQ-loss (points) per individual with B-Pb > = 20 μg/LIQ-loss (points) attributable to B-Pb > = 20 μg/LaCost attributable to B-Pb > = 20 μg/L (milj. EUR)a,d
Linear-logFLEHSI (2000–2004)340,35556.62192,7171.67 (95% CI:1.03–2.3)320,888 (95%CI: 198,859-442,931)6246 (95%CI: 3873-8621)
FLEHSII (2005–2009)364,70422.7983,1290.66 (95% CI:0.41–0.91)54,680 (95%CI: 33,878-75,475)1064 (95%CI: 659–1469)
FLEHSIII (2010–2014)347,7612.5086890.39 (95% CI:0.24–0.54)3394 (95%CI: 2102-4684)66 (95%CI: 41–91)
2000–20141,052,820   378,962 (95%CI: 234,840-523,091)7376 (95%CI: 4571-10,181)
2015–20291,052,820c2.50c26305b0.39 (95% CI:0.24–0.54)c10,275 (95%CI: 6363–14,182)200 (95%CI: 124–276)
Sensitivity analysis: Linear-intervalFLEHSI (2000–2004)340,35556.62192,7171.14 (95% CI:0.71–1.57)219,260 (95%CI: 135,881-302,619)4268 (95%CI: 2645-5890)
FLEHSII (2005–2009)364,70422.7983,1290.33 (95% CI:0.2–0.46)27,495 (95%CI: 17,041-37,944)535 (95%CI: 332–739)
FLEHSIII (2010–2014)347,7612.5086890.18 (95% CI:0.11–0.25)1569 (95%CI: 972–2164)31 (95%CI: 19–42)
2000–20141,052,820   248,323 (95%CI: 153,893-342,726)4833 (95%CI: 2995-6671)
2015–20291,052,820c2.50c26,305b0.18 (95% CI:0.11–0.25)c4750 (95%CI: 2942-6550)92 (95%CI: 57–127)
  1. Abbreviations: B-Pb Blood lead level, CI Confidence Interval
  2. aTaking into account the fraction of the population having B-Pb ≥ 20 μg Pb/L
  3. bestimated based on percentage of adolescents exceeding 20 μg Pb/L in FLEHSIII (2.50%) and total number of 15 year-olds in the period 2000–2014 (1052820): 2.5% × 1,052,820 = 26,305
  4. cset equal to values FLEHSIII
  5. dBased on lifetime value of 1 IQ point, i.e. € 19,464 (euro 2018)