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Titolo:
Group-based measurement strategies in exposure assessment explored by bootstrapping
Autore:
Hoozemans, MJM; Burdorf, A; van der Beek, AJ; Frings-Dresen, MHW; Mathiassen, SE;
Indirizzi:
Univ Amsterdam, Acad Med Ctr, Coronel Inst Occupat & Environm Hlth, AmCOGGAmsterdam Ctr Res Hlth & Hlth Care, NL-1100 DE Amsterdam, Netherlands Univ Amsterdam Amsterdam Netherlands NL-1100 DE E Amsterdam, Netherlands Erasmus Univ, Dept Publ Hlth, Rotterdam, Netherlands Erasmus Univ Rotterdam Netherlands pt Publ Hlth, Rotterdam, Netherlands Malmo Univ, Fac Technol & Soc, Div Prod Ergon, Malmo, Sweden Malmo Univ Malmo Sweden ac Technol & Soc, Div Prod Ergon, Malmo, Sweden Natl Inst Working Life, Stockholm, Sweden Natl Inst Working Life Stockholm Sweden Working Life, Stockholm, Sweden
Titolo Testata:
SCANDINAVIAN JOURNAL OF WORK ENVIRONMENT & HEALTH
fascicolo: 2, volume: 27, anno: 2001,
pagine: 125 - 132
SICI:
0355-3140(200104)27:2<125:GMSIEA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
MUSCULOSKELETAL DISORDERS; BACK DISORDERS; WORK; LOAD;
Keywords:
accuracy; epidemiology; manual materials handling; observation; occupation; precision;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Hoozemans, MJM Univ Amsterdam, Acad Med Ctr, Coronel Inst Occupat & Environm Hlth, AmCOGGAmsterdam Ctr Res Hlth & Hlth Care, POB 22700, NL-1100 DE Amsterdam, Netherlands Univ Amsterdam POB 22700 Amsterdam Netherlands NL-1100 DE
Citazione:
M.J.M. Hoozemans et al., "Group-based measurement strategies in exposure assessment explored by bootstrapping", SC J WORK E, 27(2), 2001, pp. 125-132

Abstract

Objectives The precision of mean exposure to pushing was examined in 2 occupational groups using various combinations of the number of workers and measurements per worker. Methods The frequency and duration of pushing of the 2 occupational groupswas assessed using onsite observation. All data were divided into successive periods of 30 minutes of observation. The precision of the group mean exposure to pushing was expressed by 90% confidence intervals obtained by bootstrapping. The effect on the confidence interval of varying numbers of workers and numbers of periods per worker was examined. Results For both occupational groups there was little precision to be gained when > 10 workers were observed. Within the maximum number of workers used in the bootstrap simulations, it appeared that, beyond 10 workers, the confidence intervals decreased by <5% for every worker that was added, when each worker was observed at least 8 periods of 30 minutes. If workers were observed exactly 4 periods of 30 minutes per worker, an additional 4 workers were required to compensate for the loss of precision. An unbalanced strategy with approximately 8 periods of 30 minutes per worker hardly decreasedthe precision of the group mean, however. Conclusions The precision of the group-based mean exposure to pushing is influenced by the number of workers observed and by the number of repeated measurements per worker. In the planning of measurement strategies, it is advisable to account for possible sources of variance in advance and to assess the exposure variability.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 13:05:13