We analysed data distributions by visual inspection of histograms. We used the chi-squared test for comparisons of nominal variables (sex and hip fracture). The normally distributed data (age at the time of admission) was analysed using the independent Student's t-test. For non-normally distribu...
(pinch-up), needle entry angle, site rota- tion, dwell time of needle under the skin, site inspection by a health care professional, needle reuse, sharps dis- posal), observed anomalies at injection sites (lipohyper- trophy), knowledge about injections (identity of trainer, themes covered ...