Using mobile phone-based text message to recruit representative samples: Assessment of a cross-sectional survey about the COVID-19 vaccine hesitation.

BACKGROUND: Limited research has examined mobile phone-based platforms for survey recruitment, especially during the COVID-19 pandemic in Brazil. Our objective was to investigate the feasibility and representativeness of mobile phone-based advertisement during a preliminary study about COVID-19 vaccine hesitation in Brazil. Moreover, we evaluate whether the older population can be reached through mobile phone-based platforms of the survey. METHODS: We conducted a study in December 2021 based on a preliminary survey about the COVID-19 vaccine hesitation in Assis, Brazil, Sao Paulo state. From a list of the adult population hesitant about the second dose of the COVID-19 vaccine, we sent a mobile phone-based advertisement inviting the participants to answer the survey for one week. The respondent's data were collected in a Google form platform. The comparison between the target population and the respondents was made using the Chi-squared test and the Welch's test, using a P-value of 0.05 as significative. RESULTS: The response rate was 9.99% after one week. The mean age of the respondent group was 33.97 (SD 14.99) and 35.05 (SD 14.19) of the population, with a P-value of 0.192 and a Cohen's d coefficient of 0.0754, corresponding to a small effect size between groups. We demonstrate that the mobile phone-based survey is a feasible and representative strategy during the pandemics in Brazil. Moreover, the older population respondent was representative. CONCLUSION: We achieved a representative sample of respondents using the mobile phone-based survey in Brazil. Furthermore, it was representative of all sociodemographic and health characteristics assessed. Finally, these findings suggest that the method is a highly feasible and economical means of recruiting for survey research.

Influência do baixo peso ao nascer sobre o desempenho motor de lactentes a termo no primeiro semestre de vida / Influence of the low birth weight on motor performance of term infants in the first semester of life

Este estudo teve por objetivo verificar a repercussao do baixo peso ao nascer (BPN) no desempenho motor, no primeiro semestre de vida, lactentes nascidos a termo, pequenos para a idade gestacional (PIG) comparando esses com um grupo -controle nascido com peso adequado para a idade gestacional (AIG). Para verificar a influencia do BPN sobre o desenvolvimento motor foramexcluidas da amostra a prematuridade e as patologias diagnosticadas ao nascimento. Tratou-se de um estudo de corte seccional e duplo-cego, no 3o. e no 6o. mes de vida. O desempenho motor foi mensurado com a Alberta Infant Motor Scale, a qual classifica os lactentesem uma curva de desenvolvimento, que varia entre o percentil 5 e 90. Para comparar os grupos foi utilizado o teste F para as variancias e o teste t para as medias (nivel de significancia fixado em 5 (por cento). No 3o. mes, o grupo PIG apresentou percentil medio inferior ao grupo AIG, no entanto, tal diferenca nao foi significativa. No 6o. mes, o perecentil medio do grupo AIG foi maior que o do grupo PIG, com diferenca significativa (p<0,05). Ambos os grupos de lactentes apresentaram instabilidade na aquisicao da motricidade e percentil medio inferior ao grupo normativo canadense (50 por cento). Conclui-se, entao, que o peso de nascimento pode ter influenciado a performance motora dos grupos, favorecendo o grupo AIG. Os resultados contribuirao para o diagnostico precoce de alteracoes motoras, bem como para o conhecimento dos fatores de risco para o desenvolvimento infantil