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Table 1 Patient demographics and characteristics of survey respondents

From: Burden of disease in pediatric patients with hypophosphatasia: results from the HPP Impact Patient Survey and the HPP Outcomes Study Telephone interview

Characteristic Patients (n = 59)
Sex, n (%)
 Male 30 (50.8)
 Female 29 (49.2)
Mean height, cm (SD)
 Male (n = 26) 106.5 (29.4)
 Female (n = 27) 105.7 (35.1)
Mean height Z-score, (SD)a
 Male (n = 30) −3.0 (3.5)
 Female (n = 29) −3.2 (2.3)
Age at survey, years
 Mean (SD) 7.6 (5.1)
 Range 0–17
Age at HPP symptom onset, years
 Mean (SD) 0.8 (0.9)
 Range 0–4
Duration of symptomatic disease, years
 Mean (SD) 7.0 (5.0)
 Range 0–16
  1. a Mean height Z-scores were calculated using the Centers for Disease Control and Prevention method; because the date of birth or exact age in months for each patient was unknown, reported ages in whole numbers were rounded to 0.5 years (e.g. ages of 2 to < 3 years were rounded to 2.5 years)
  2. HPP hypophosphatasia, SD standard deviation