Table 8.

Age–specific incidence rates and cumulative risks of nephrolithiasis among males and females during childhood and over a lifetime in 1997 and 2012

Age Group (yr)Length of Age Class (ti)19972012
Age-Specific Rate per 100,000 (ai)Age-Specific Ratea (Length of Age Class) per 100,000 (aiti)Age-Specific Rate per 100,000 (ai)Age-Specific Ratea (Length of Age Class) per 100,000 (aiti)
Females
 <10104.2342.263.0030.03
 10–14511.3056.5226.09130.43
 15–19579.43397.17154.91774.53
 20–245149.04745.18232.491162.44
 25–3410201.452014.50292.042920.42
 36–4410178.921789.18306.803068.00
 45–6420183.053661.05226.104521.90
 ≥65a20120.302406.03196.593931.78
 Cumulative rateb per 100,000: 0–19495.96935.00
 Cumulative risk,c %: 0–190.490.93
 Cumulative rateb per 100,000: 0–8511,111.9016,539.53
 Lifetimea risk,c %: 0–8510.5215.24
Males
 <10101.4514.543.8938.95
 10–1456.8134.0418.9694.79
 15–19554.27271.3795.49477.46
 20–245181.36906.82220.611103.06
 25–3410363.173631.71340.323403.23
 36–4410382.903828.98427.884278.83
 45–6420509.5410,190.88391.147822.88
 ≥65a20360.377207.43399.547990.82
 Cumulative rateb per 100,000: 0–19319.95611.19
 Cumulative risk,c %: 0–190.320.61
 Cumulative rateb per 100,000: 0–8526,085.7625,210.00
 Lifetimea risk,c %: 0–8522.9622.28
  • a Assuming lifetime risk is from (0–85 years)i.

  • b Cumulative rate =Embedded Image.

  • c Cumulative risk =100×(1−exp(−cumulative rate/100,000)).