Total (n = 760)

Female (n = 719)

Male

(n = 41)

p value

Age (year)

40(12.6)

39.7(12.4)

46.1(15.4)

0.013

Ca(mg/dL)

9.5(1.2)

9.5(1.2)

9.5(0.7)

0.829

Corrected Ca (mg/dL)

9.7(0.5)

9.7(0.5)

9.8(0.8)

0.387

Phosphate (mg/dL)

3.5(0.6)

3.5(0.6)

3.6(0.6)

0.249

iPTH (pg/mL)

58.2(39.9)

58.9(40.4)

45.1(26.2)

0.031

25(OH) D (ng/mL)

20.4(17.2)

20.2(17.1)

24.7(18.5)

0.103

Total

Females

Males

Winter (n = 448)

Summer (n = 312)

p value

Winter (n = 428)

Summer (n = 291)

p value

Winter (n = 20)

Summer (n = 21)

p value

Age (year)

37.4(11.4)

43.8(13.4)

0.0001

37.3(11.2)

43.1(13.2)

0.0001

39.5(14.7)

52.3(13.7)

0.006

Ca(mg/dL)

9.4(0.5)

9.6(1.8)

0.048

9.4(0.5)

9.6(1.9)

0.048

9.6(0.8)

9.5(0.7)

0.752

Corrected Ca (mg/dL)

9.7(0.5)

9.7(0.6)

0.055

9.7(0.5)

9.7(0.6)

0.082

10.0(0.8)

9.7(0.8)

0.239

Phosphate (mg/dL)

3.5(0.5)

3.5(0.6)

0.593

3.5(0.6)

3.5(0.6)

0.759

3.6(0.6)

3.7(0.6)

0.458

iPTH (pg/mL)

54.2(32.8)

63.9(47.7)

0.002

54.6(32.9)

65.3(48.8)

0.001

45.5(30.8)

44.8(21.7)

0.927

25(OH) D (ng/mL)

21.3(17.5)

19.2(16.7)

0.110

21.1(17.4)

18.8(16.5)

0.084

24.8(19.4)

24.5(18.0)

0.963