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Table 5 Comparison of dried versus liquid urine analysis (n = 18)

From: Evaluating urinary estrogen and progesterone metabolites using dried filter paper samples and gas chromatography with tandem mass spectrometry (GC–MS/MS)

Variable

Dried

Liquid

Difference [95% confidence interval]

ICC

Estradiol (ng/mg-Cr)

1.32 (0.70, 3.26)

1.29 (0.74, 3.36)

− 0.09 [− 0.19, 0.01]

0.99

Estrone (ng/mg-Cr)

10.78 (6.26, 18.73)

12.78 (7.22, 20.65)

− 1.28 [− 2.47, − 0.09]*

0.96

5α-pregnanediol (ng/mg-Cr)

65.81 (27.49, 257.23)

62.29 (32.18, 248.25)

− 5.72 [− 29.16, 17.71]

0.98

5β-pregnanediol (ng/mg-Cr)

243.90 (99.22, 408.88)

270.25 (135.96, 400.42)

− 98.67 [− 211.46, 14.13]*

0.94

  1. Data presented as median (IQR)
  2. Differences were calculated using a signed rank test (dried-liquid assay), as variables were not normally distributed
  3. ICC intraclass correlation coefficient
  4. * p = 0.04