Whenever age cannot be estimated from dental formation in immature human skeletal remains, other methods are required. In the post-natal period, development of the skeleton provides alternative age indicators, namely, those associated with skeletal maturity of the cranium. This study wishes to document the age at which the various ossification centres in the occipital bone fuse and provide readily available developmental probabilistic information for use in age estimation. A sample of 64 identified immature skeletons between birth and 8 years of age from the Lisbon collection was used (females = 29, males = 35). Results show that fusion occurs first in the posterior intra-occipital synchondrosis and between the jugular and condylar limbs of the lateral occipital to form the hypoglossal canal (1-4 years), followed by the anterior intra-occipital (3-7 years). Fusion of the post-natal occipital does not show differences in timing between males and females. Relative to other published sources, this study documents first and last ages of fusion of several ossification centres and the posterior probabilities of age given a certain stage of fusion. Given the least amount of overlap in stages of fusion, the closure of the hypoglossal canal provides the narrowest estimated age with the highest probability of age.

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Sexually Transmitted Infections (STIs) are global public health problems. Adolescents are a vulnerable age group of STIs. This study aims to determine the relationship between knowledge and attitudes and behaviors towards STIs in adolescents in Comoro, Dili, Timor-Leste. This study was descriptive with a cross-sectional approach conducted in Canossa highschool and Externato de São Jose highschool from April-June 2022. The independent variables were knowledge and attitude, the dependent variable was adolescent behavior. The sample of this study was adolescents in 15-18 years old in Canossa highschool and Externato de São Jose and willing to become the respondent, 85 adolescents were selected as respondent. The results showed that 71.8% of respondents have good knowledge, 67.1% of respondents have good attitudes and 75.3% of respondents have good behavior in relation to STIs. The results of the analysis of the relationship between knowledge and attitudes to risk behavior for STIs 83.6% of respondents were categorized as good knowledge and have good behavior in relation to STIs and 84.2% of respondents were having good attitudes and have good behavior in relation to STIs. The results of the chi-square statistical test on knowledge and attitude variables obtained a p-value of 0.01, therefore, there is a significant relationship between the knowledge and attitudes of respondents regarding risk behavior for STIs. Comprehensive education regarding sexual health is needed for adolescents in Comoro Dili Timor-Leste. Keywords: Adolescents, STIs, HIV, Infectious diseases.