a. A combined comparison in both Zambian and Zimbabwean children according to the season when the samples were collected: cool (n = 73), hot (n = 88) and rainy (n = 280): Kruskal-Wallis was used. b. A separate comparison of 25(OH)D concentrations according to the season of sample collection in each country. Cool; Zambia (n = 13) vs Zimbabwe (n = 60); Hot; Zambia (n = 24) vs Zimbabwe (n = 64); Rainy; Zambia (n = 64) vs Zimbabwe (n = 216). Kruskal-Wallis was used.