Table 1—

Characteristics of the patients hospitalized at least once for type 1 diabetes, 1975–2004, Sweden

WomenMenTotal
n15,00116,35331,354
Age at enrollment (years)19.9 ± 11.319.6 ± 11.119.7 ± 11.1
Mean calendar year at entry199019911991
Follow-up duration (years)13.1 ± 7.612.0 ± 7.412.5 ± 7.5
Person-years accumulated196,928196,206393,134
Patients with (%)
    Ophthalmic complications*20.616.418.4
    Diabetic nephropathy9.28.58.8
    Neurological complications7.17.17.1
No. of nontraumatic LEAs§201264465
    Amputation above knee181129
    Amputation below knee82111193
    Amputation below ankle101142243
Age at diagnosis (years)45.1 ± 7.645.6 ± 8.145.4 ± 7.8
  • Data are means ± SD unless indicated otherwise.

  • * Ophthalmic complications defined by ICD-7 codes 260.20, 260.21, and 260.29, ICD-8 codes 250.01, 250.02, and 250.03, ICD-9 code 250E, and ICD-10 codes E10.3, E11.3, E12.3, E13.3, and E14.3.

  • Diabetic nephropathy defined by ICD-7 code 260.30, ICD-8 code 250.40, ICD-9 code 250D, and ICD-10 codes E10.2, E11.2, E12.2, E13.2, and E14.2.

  • Neurological complications defined by ICD-7 codes 260.40 and 260.49, ICD-8 code 250.05, ICD-9 code 250F, and ICD-10 codes E10.4, E11.4, E12.4, E13.4, and E14.4.

  • § LEA defined by the operation code: amputation below the ankle was defined by operation codes 8750 or 8760 before 1998 and NHQ16, NHQ17, NHQ12, NHQ13, NHQ14, or NHQ99 afterwards; amputation above the ankle but below the knee was defined by operation codes 8770 or 8771 before 1998 and NGQ19, NHQ09, NHQ11, or NGQ99 afterwards; and amputation above the knee was defined by operation codes 8780 or 8781 before 1998 and NGQ09, NFQ19, or NFQ99 afterwards. Traumatic amputations of the lower-extremity were excluded.