OBJECTIVES: The aim of the study is to analyze the lethality after femur neck fractures at different time. We analyze the chance of lethality from the time of primary treatment of femoral neck fracture at different time periods according to age-group, sex and most frequently used surgical techniques. METHODS: Data derive from the database of the National Health Insurance Fund Administration and based on the ICD-10 S7200 code. The bases of the evaluation are patients over 65 with femoral neck fracture identified with Social Security Identification Number (TAJ) discharged from inpatient care institutions after primary treatment. The following time periods were included into the analysis: 0-30 days, 31-90 days, 91-180 days, 181-270 days, 271-360 days. The patients with polytrauma were excluded from the study. Regarding surgical methods, the most frequently used screw fixation and arthroplasty were evaluated. Statistical analysis means logistic regression and reference values were: males, universities and arthroplasty. RESULTS: Altogether 4141 patients were included into the study. Female:male ratio was 23.71 % : 76.29 %. Sex: The female lethality was significantly lower than male in the first half a year: in 0-30 days 0.527 (0.4398-0.6947), in 31-90 days 0.6156 (0.4897-0.7738), in 91-180 days 0.6378 (0.479-0.8491). Increasing age resulted in a significantly higher chance of lethality: 0-30 days 7.36 % 1.0736 (1.0583-1.0891), 31-90 days 6.56 % 1.0656 (1.0507-1.0807), 91-180 days 3.66 % 1.0366 (1.0186-1.055), 181-270 days 3.96 % 1.0396 (1.0168-1.0628), 271-360 days 2.93 % 1.0293 (1.0053-1.0538). According to surgical methods: arthroplasty 15.21 %, screw fixation: 69.72 %. Lethality after screw fixation was significantly higher in 0-30 days 1.9873 (1.366-2.9547) and 91-180 days 1.7168 (1.0931-2.6965). CONCLUSIONS: The chance of lethality depending on age-group highlighted the importance of early postoperative period. Higher age-groups, males and surgical methods might have an effect at different level on mortality.