Abstract
Durations of any event, such as duration of hospitalization, is usually found to have a highly skewed distribution and incomplete values due to dropouts and limited follow-up. The usual methods of statistical analysis are, therefore, not applicable. The method of survival analysis is a nonparametric method and is designed to overcome these problems. Survival is a generic term and is used for any time-to-event data. The entire survival pattern at different points in time is studied by the Kaplan-Meier method under certain conditions. Logrank method is used to compare survival pattern in two or more groups. Hazard is the rate of occurrence of an event per unit of time and studied by Cox method. The concept of survival and all these methods of survival analysis are briefly discussed in this short note in a non-mathematical format for medical audience.
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Hanna Y, Laliberté C, Ben Fadel N, et al. Effect of oxygen saturation targets on the incidence of bronchopulmonary dysplasia and duration of respiratory supports in extremely preterm infants. Pediatr Child Health. 2020;25:173–9.
Bryson AE, Cabral HJ, Coles MS. Attendance of an initial follow-up visit after long-acting reversible contraception insertion and method continuation among adolescents and young adults: a retrospective study. J Pediatr Adolesc Gynecol. 2021:S1083-3188(21)00004-8.
Jha, UM, Dhingra N, Raj Y, et al. Survival of children living with human immunodeficiency virus on antiretroviral therapy in Andhra Pradesh, India. Indian Pediatr. 2018;55;301–5.
Indrayan A, Malhotra RK. Medical Biostatistics, Fourth Edition. CRC Press; 2018.
Wainstock T, Walfisch A, Sergienko R, Sheiner E. Maternal anemia and pediatric neurological morbidity in the offspring-Results from a population based cohort study. Early Hum Dev. 2019;128:15–20.
Cook NE, Iverson GL, Maxwell B, Zafonte R, Berkner PD. Adolescents with ADHD do not take longer to recover from concussion. Front Pediatr. 2021;8:606879.
Cleves M, Gould W, Marchenko Y. An introduction to survival analysis using stata. Third edition. Stata Press; 2016.
Siraj AK, Parvathareddy SK, Qadri Z, et al. Annual hazard rate of recurrence in Middle Eastern papillary thyroid cancer over a long-term follow-up. Cancers (Basel). 2020;12:3624.
Cox DR. Regression models and life tables. J Royal Stat Soc B 1972;34:187–220.
Kleinbaum DG, Klein M. Survival Analysis: A Self learning text. Second edition. Springer; 2005.
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Indrayan, A., Tripathi, C.B. Survival Analysis: Where, Why, What and How?. Indian Pediatr 59, 74–79 (2022). https://doi.org/10.1007/s13312-022-2425-5
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DOI: https://doi.org/10.1007/s13312-022-2425-5