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Table 3 Sampling details and MTX and 7-OH-MTX concentrations

From: Adherence to low-dose methotrexate in children with juvenile idiopathic arthritis using a sensitive methotrexate assay

Details of sampling a

Baseline

Follow up

Time to sampling since MTX start (days)

75 (59–96)

358 (315–395)

MTX concentration (nM)

0.34 (0.28–0.88)

0.30 (0.24–0.50)

Dose-normalised MTX (nM/mg)

0.03 (0.02–0.07)

0.03 (0.02–0.06)

7-OH-MTX concentration (nM)

1.58 (0.76–7.51)

1.08 (0.59–2.91)

Dose-normalised 7-OH-MTX (nM/mg)

0.12 (0.06–0.75)

0.09 (0.04–0.29)

MTX:7-OH-MTX ratio

3.52 (2.93–7.80)

4.12 (2.48–6.35)

  1. a median (interquartile range); 7-OH-MTX, 7-hydroxy-methotrexate; MTX, methotrexate