Practitioners often struggle with the overwhelming number of security practices outlined in cybersecurity frameworks for risk mitigation. Given the limited budget, time, and resources, practitioners want to prioritize the adoption of security practices based on empirical evidence.  Therefore, developing empirical research to evaluate the security outcome of recommended practices is both a research priority and a fundamental prerequisite for evidence-based security decision-making. The study investigated the relationship between publicly available data on security practice adoption and security outcomes metrics. Our findings reveal that aggregated adoption of security practices is associated with 5.2 fewer vulnerabilities, 216.8 days faster MTTR, and 52.3 days faster MTTU. Repository characteristics have an impact on security practice effectiveness: repositories with high security practices adoption, especially those that are mature, actively maintained, large in size, have many contributors, few dependencies, and high download volumes, tend to exhibit better outcomes compared to smaller or inactive repositories. Among individual security practices, Code Review, Contributors from diverse organizations, License, CI-Tests, and Pinned Dependencies show strong associations with security outcomes.