International Journal of Epidemiology
Volume 44 Issue 1 February 2015
http://ije.oxfordjournals.org/content/current
Data Resource Profile: The sentinel panel of districts: Tanzania’s national platform for health impact evaluation
Gregory S Kabadi1,3,*, Eveline Geubbels1, Isaac Lyatuu1, Paul Smithson1, Richard Amaro1,
Sylvia Meku2, Joanna A Schellenberg3 and Honorati Masanja1
Abstract
The Sentinel Panel of Districts (SPD) consists of 23 districts selected to provide nationally representative data on demographic and health indicators in Tanzania. The SPD has two arms: SAVVY and FBIS. SAVVY (SAmple Vital registration with Verbal autopsY) is a demographic surveillance system that provides nationally representative estimates of mortalities based on age, sex, residence and zone. SAVVY covers over 805 000 persons, or about 2% of the Tanzania mainland population, and uses repeat household census every 4–5 years, with ongoing reporting of births, deaths and causes of deaths. The FBIS (Facility-Based Information System) collects routine national health management information system data. These health service use data are collected monthly at all public and private health facilities in SPD districts, i.e. about 35% of all facilities in Mainland Tanzania. Both SAVVY and FBIS systems are capable of generating supplementary information from nested periodic surveys. Additional information about the design of the SPD is available online: access to some of SPD’s aggregate data can be requested by sending an e-mail to [hmasanja@ihi.or.tz].
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Infant birthweight and risk of childhood cancer: international population-based case control studies of 40 000 cases
Kate A O’Neill1,4,*, Michael FG Murphy2,4, Kathryn J Bunch3,4, Susan E Puumala5, Susan E Carozza6, Eric J Chow7, Beth A Mueller7, Colleen C McLaughlin8, Peggy Reynolds9, Tim J Vincent4, Julie Von Behren9 and Logan G Spector10
Author Affiliations
1Department of Paediatrics, 2Nuffield Department of Obstetrics and Gynaecology, 3National Perinatal Epidemiology Unit, 4Formerly of the Childhood Cancer Research Group, University of Oxford, Oxford, UK, 5Sanford Research Center, Sioux Falls, SD, USA, 6College of Public Health and Human Sciences, Oregon State University, Corvallis, OR, USA, 7Fred Hutchinson Cancer Research Center, Seattle, WA, USA, 8New York State Department of Health, Albany, NY, USA, 9Cancer Prevention Institute of California, Berkeley, CA, USA and 10Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA
Accepted December 15, 2014.
Abstract
Background: High birthweight is an established risk factor for childhood leukaemia. Its association with other childhood cancers is less clear, with studies hampered by low case numbers.
Methods: We used two large independent datasets to explore risk associations between birthweight and all subtypes of childhood cancer. Data for 16 554 cases and 53 716 controls were obtained by linkage of birth to cancer registration records across five US states, and 23 772 cases and 33 206 controls were obtained from the UK National Registry of Childhood Tumours. US, but not UK, data were adjusted for gestational age, birth order, plurality, and maternal age and race/ethnicity.
Results: Risk associations were found between birthweight and several childhood cancers, with strikingly similar results between datasets. Total cancer risk increased linearly with each 0.5 kg increase in birthweight in both the US [odds ratio 1.06 (95% confidence interval 1.04, 1.08)] and UK [1.06 (1.05, 1.08)] datasets. Risk was strongest for leukaemia [USA: 1.10 (1.06, 1.13), UK: 1.07 (1.04, 1.10)], tumours of the central nervous system [USA: 1.05 (1.01, 1.08), UK: 1.07 (1.04, 1.10)], renal tumours [USA: 1.17 (1.10, 1.24), UK: 1.12 (1.06, 1.19)] and soft tissue sarcomas [USA: 1.12 (1.05, 1.20), UK: 1.07 (1.00, 1.13)]. In contrast, increasing birthweight decreased the risk of hepatic tumours [USA: 0.77 (0.69, 0.85), UK: 0.79 (0.71, 0.89) per 0.5 kg increase]. Associations were also observed between high birthweight and risk of neuroblastoma, lymphomas, germ cell tumours and malignant melanomas. For some cancer subtypes, risk associations with birthweight were non-linear. We observed no association between birthweight and risk of retinoblastoma or bone tumours.
Conclusions: Approximately half of all childhood cancers exhibit associations with birthweight. The apparent independence from other factors indicates the importance of intrauterine growth regulation in the aetiology of these diseases.