Healthcare utilization after mass trauma: a register-based study of consultations with primary care and mental health services in survivors of terrorism.

Background: Knowledge on healthcare utilization after mass trauma is needed to strengthen the public health preparedness to such incidents. Using register-based data, this study had a unique opportunity to investigate how young survivors' use of primary care physicians (PCP) and mental health services (MHS) changed after a terrorist attack.

Methods: We examined register-based data on PCP and MHS consultations among 255 survivors (52% male) of the 2011 Utøya youth camp attack in Norway 3 years before and after the attack, and their reason for encounter with the PCP according to the International Classification for Primary Care (ICPC- 2).

Results: The PCP and MHS consultation rates (CR) were higher in female than male survivors both acutely and at long-term. The mean yearly CRs increased from 2.25 to 4.41 for PCP and 1.77 to 13.59 for MHS the year before and after the attack in female survivors, and from 1.45 to 3.65 for PCP and 1.02 to 11.77 for MHS in male survivors. The third year post-attack CRs for PCP were 3.55 and 2.00; and CRs for MHS were 5.24 and 2.30 in female and male survivors, respectively. Among female survivors, 76% consulted PCP and 12% MHS the year preceding the attack; post-attack 93% consulted PCP and 73% MHS the first year; decreasing to 87 and 40% the third year. Among male survivors, 61% consulted PCP and 7% MHS the year preceding the attack; post-attack 86% consulted PCP and 61% MHS the first year, and 67 and 31% the third year. As for PCP consultations, there was a particular increase in psychological reasons for encounter following the attack.

Conclusions: This study indicates that it is important to anticipate an increased healthcare utilization several years following mass trauma, particularly of MHS. Both PCP and MHS practitioners played important roles in providing healthcare for psychological problems in young survivors of terrorism in a country with universal and largely publicly financed healthcare and a gatekeeping system. The healthcare utilization could be different in countries with other health systems or psychosocial care responses to mass trauma.