Seventy-seven patients using modified Bu/Cy plus ATG regimen (Bu group) were randomly selected in a 1 to 3 1 ratio matching for age, disease and status, year of HSCT (±2 years), and length of follow-up.
Additionally, Control subjects were recruited following headache subjects to allow matching for age and gender.
The multivariate Cox proportional hazards model with matching for age and sex was used to assess the possible associations between TTH and OSA among the patients.
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Beyond matching for age, there was no adjustment for confounders.
Controls were selected matching for age, sex, number of previous transplants and date of transplant.
The next step was matching for age, using a window of 5 years.
This difference persisted when matching for age p = 0.01 (table 2).
Some tumor types were so rare, that after matching for age, no match for type could be found.
For each case, one control was randomly selected from population registers after matching for age, sex, and region of residence.
Control samples were randomly chosen from the Swedish population registry, matching for age, sex, and residential area.
