Population stress, growth deficit, and degenerative joint disease in foragers from South Africa's Later Stone Age
Year: 2015
Type: dissertation
Study design: Observational Study
Abstract: Harsh conditions during development may alter the human adult phenotype in ways that affect vulnerability to disease and death. This study’s objectives are A) to explore the utility of neural canal size and appendicular osteoarthritis as prospective indicators of developmental stress; B) to test for developmental stress effects in a foraging population with no significant socioeconomic stratification; and C) to explore temporal variation in neuroskeletal size and joint degeneration. The study sample consists of 143 Later Stone Age foragers (M=75, F=64, I=4) from the Cape Floristic Region of southern Africa. 135 cases have radiocarbon dates between 9100 and 560 uncalibrated years BP. Osteoarthritis was quantified with an ordinal scoring procedure. Relationships among radiocarbon date, measures of body and neural canal size, OA, and age at death were explored using logistic and ordinary least squares regression, independence tests, and means contrasts. Age, sex, and body size were controlled where appropriate. A positive relationship is observed between age at death and both body size and ML NC diameter, but reaches statistical significance only in the latter case (OR=1.74, 95% CI=1.08–2.82). The effect is detected in both sexes but odds ratios are greater and p values smaller in females (Male OR=1.50, 95% CI=0.82–2.73; Female OR=2.14, 95% CI=1.02–4.50). Age at death is the only significant predictor for both presence and severity of osteoarthritis. No significant relationship is observed between age and anteroposterior diameter. Average mediolateral diameter of the neural canal declines between 3000–2000BP and increases slightly afterwards (β 1 = −0.83, β 2 = 0.68, adjusted R 2 = 0.06, SEE=0.99). This quadratic curve is consistent with published accounts of temporal change in average body size. No temporal pattern is identified in osteoarthritis.
Source: TSpace (University of Toronto)
Author: L. Elizabeth Doyle
Language: English
Subfield: Archeology (arts and humanities)
Field: Arts and Humanities
Domain: Social Sciences
Open Access status: green
Funder: University of Toronto
OpenAlex ID: W2566555861