Objective Accidental occupational injuries to health care workers (HCWs) continue to have a significant problem in the healthcare system. Thus, the aim of this study was to assess prevalence of needle sticks and sharp injury and associated factors among health care workers working in Central Zone Tigray northern Ethiopia. Result The prevalence of needle stick and sharp injury in the past 12 months preceding the study and entire job were 25.9% and 38.5% respectively. Nearly one-third (31%) of the injuries occurred in emergency unit and 122 (71.3%) of the materials caused injury were used on patients. Practice of needle recap, ever used cigarette in last 12 months, training, work hours > 40 per week, job dissatisfaction and work experience less than 5 years were found factors significantly associated with needle stick and sharp injury for health care workers. The magnitude of Needle stick and sharp injury is high in the study area. Policy makers should formulate strategies to improve the working condition for healthcare workers and increase their adherence to universal precautions.

Objective Premarital sexual practice during adolescence time may lead to different sexual and reproductive health problems including HIV/AIDS. This study was aimed to assess the prevalence of premarital sexual practice and associated factors among adolescents living in the refugee camps in Tigray, northern Ethiopia. Result The prevalence of premarital sexual practice was 47.6% [95% CI (43.3%, 51.9%)]. The age (mean ± SD) of the study participants was 17.4 ± 2.71 (15–24 years) and 68.8% of them were males. Being in the age group 14–19 years [AOR = 4.50, 95% CI (2.29–8.84)] or 20–24 years [AOR = 9.76, CI (4.58–20.82)], living with friends [AOR = 5.24, 95% CI (2.28–12.05)] or alone [AOR = 5.72, 95% CI (2.69–12.19)], being in primary school [AOR = 6.93, 95% CI (3.08–15.57)] or college [AOR = 4.33, CI (1.44–13.02)], getting pocket money [AOR = 4.14, 95% CI (2.31–7.41)], parents being either divorced [AOR = 5.11, 95% CI (2.42–10.80)] or widowed [AOR = 3.52, 95% CI (1.69–7.33)], alcohol consumption [AOR = 1.99, 95% CI (1.20–3.38)] were independent predictors of premarital sexual practice among the adolescents. Electronic supplementary material The online version of this article (10.1186/s13104-019-4459-x) contains supplementary material, which is available to authorized users.