Table 1 Baseline demographic data of the patients

Age, years, mean (SD)

13.6 (2.5)

Female gender (n)

92

Duration of disease, years, median (IQR)

1.8 (0.4–3.9)

Household income, Thai baht/month, median (IQR)

10,000 (5,500–21,500)

Interval between the first and second visit, days, median (IQR)

113 (95–154)

Subspecialty clinic (n)

- Nephrology clinic

56

- Rheumatology clinic

41

- Dermatology clinic

3

Medications (n)

- Hydroxychloroquine

97

- Prednisolone

83

- Mycophenolate mofetil

37

- Azathioprine

9

- Cyclosporine

1

- Methotrexate

1

Vitamin D supplement (Ergocalciferol)

- Intake (n)

87

- Dose, international unit/day, median (IQR)

2166.66 (1333.33–2666.67)

Chronic kidney disease^a (n)

32