Background characteristics, incidence of symptomatic rotavirus infections per personyear of observation for children <2 years and bias assessment of 21 prospective studies included in the meta-analysis.

Inc: incidence; SocioEconomic Status (ses): low (L: study group living in poor, crowded area), probably low (PL: studies performed in developing countries), not low (NL: studies performed in developed countries) or unclear (U). NR: not reported, N: no high risk of bias, P: possible high risk of bias and H: high risk of bias in the reported incidences. 1children were followed for the first year of life only.