Interviews were conducted at 3 months post-injury with 2856 New Zealand residents aged 18–64 years enrolled in the Prospective Outcomes of Injury Study (POIS); all study participants had experienced ≥1 injuries between June 2007 and May 2009. This investigation examined the prevalence of health and social outcomes pre- and 3 months post-injury, and the association between New Injury Severity Scores (NISS) and 3-month outcomes, for the 566 participants who reported Māori ethnicity. High levels of adverse outcomes were observed 3 months post-injury: 49% reported problems with mobility; 56% reported trouble performing usual activities; 70% were experiencing pain or discomfort; and 45% were experiencing a moderate level of psychological distress. The prevalence of some adverse outcomes increased with increasing NISS but a high level of problems were still experienced by those classified as having a ‘minor’ injury. Nonetheless, 71% were satisfied with life and 81% were satisfied with global social relationships at 3 months, and 74% considered themselves to have good to excellent overall health.