Table 3.

Characteristics of patients with normal serum alkaline phosphatase (SAP) activity vs. those with high SAP activity.

Characteristic	Normal SAP (n=17)	High SAP (n=35)	P value
Age (years)
Mean±SD	42.3±12.4	33.5 ± 12.01	0.018*
> 30 years	88 %	60 %	0.036*
Lag time < 3 years	24 %	60 %	0.014*
Bone pain	35 %	83 %	0.001*
Fracture	35 %	54 %	0.161
Creatinine ≥133μmol/L	50 %	19 %	0.030*
Hypercalcemia (>2.74mmo/L)	88 %	86 %	0.587
Hypophosphatemia (<1mmol/L)	77 %	60 %	0.390
PTH (ng/L),
Mean±SD	338±256	1044 ± 729	0.001*
>500 ng/L	18 %	82 %	0.007*
Osteitis fibrosa cystica	41 %	66 %	0.093
Bone disease	60 %	100 %	0.001*

^*Significant