Table 6.

Comparison of geometric means and percentiles of serum PFNA (in ng/mL) in SHOW (2014–2016) and NHANES (2015–2016) by age, sex and race.

Sample	Characteristic	n	Geometric mean (95% CI)	50th (95% CI)	75th (95% CI)	90th (95% CI)	95th (95% CI)
	Age
SHOW	18–39	162	0.36 (0.32–0.41)	0.40 (0.30–0.40)	0.60 (0.50–0.70)	0.80 (0.70–1.10)	1.10 (0.80–1.40)
NHANES	18–39	674	0.46 (0.43–0.50)	0.40 (0.30–0.40)	0.70 (0.60–0.70)	1.00 (0.90–1.00)	1.30 (1.10–1.50)
SHOW	40–59	208	0.44 (0.40–0.48)	0.40 (0.40–0.50)	0.60 (0.60–0.70)	0.90 (0.80–1.20)	1.30 (1.00–1.70)
NHANES	40–59	581	0.60 (0.55–0.66)	0.50 (0.50–0.60)	0.90 (0.80–1.00)	1.30 (1.20–1.50)	1.90 (1.40–2.30)
SHOW	60+	233	0.62 (0.56–0.67)	0.60 (0.60–0.70)	0.90 (0.80–0.90)	1.40 (1.20–1.80)	2.10 (1.50–2.60)
NHANES	60+	574	0.78 (0.71–0.85)	0.70 (0.60–0.80)	1.10 (1.00–1.30)	1.70 (1.50–2.00)	2.30 (1.90–2.60)
	Sex
SHOW	Male	257	0.47 (0.43–0.51)	0.50 (0.40–0.50)	0.70 (0.60–0.80)	1.00 (0.90–1.20)	1.40 (1.10–2.10)
NHANES	Male	865	0.64 (0.60–0.69)	0.50 (0.40–0.50)	0.90 (0.80–1.00)	1.40 (1.10–1.40)	1.90 (1.50–2.10)
SHOW	Female	346	0.44 (0.40–0.48)	0.40 (0.40–0.50)	0.70 (0.60–0.80)	1.10 (0.90–1.30)	1.40 (1.20–2.00)
NHANES	Female	964	0.54 (0.50–0.58)	0.40 (0.30–0.40)	0.80 (0.70–0.80)	1.30 (1.10–1.40)	1.90 (1.40–2.40)
	Race
SHOW	White (Non-Hispanic)	502	0.48 (0.45–0.51)	0.50 (0.40–0.50)	0.70 (0.70–0.80)	1.10 (0.90–1.30)	1.50 (1.30–2.10)
NHANES	White (Non-Hispanic)	563	0.58 (0.54–0.62)	0.50 (0.40–0.50)	0.90 (0.70–0.90)	1.30 (1.10–1.40)	1.90 (1.40–2.30)
SHOW	Non-White	100	0.36 (0.31–0.41)	0.30 (0.30–0.40)	0.60 (0.50–0.70)	0.80 (0.60–1.10)	1.00 (0.80–1.50)
NHANES	Non-White	1266	0.60 (0.57–0.63)	0.50 (0.40–0.50)	0.90 (0.80–1.00)	1.40 (1.30–1.50)	1.90 (1.60–2.00)

CI confidence interval.