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This article presents the findings of a descriptive correlational study that investigates personal evaluations of behaviours that characterize coexistence in public spaces in cities in seven Latin American countries. A total of 1,337 people of different genders and age groups participated in the research, evaluating the contribution of different behaviours associated with coexistence through an ad hoc questionnaire containing 50 items. Multidimensional scaling analysis (SSA) indicates that people assess the behaviours explored based on the function they attribute to coexistence. Albeit with some variations, there are overlaps in several of the dimensions into which the items in the questionnaire were grouped, including, for most cities, safety, environmental protection, socialization and mobility. The results are discussed on the basis of cultural differences, the consequences for quality of urban life and the formulation of public policy for citizen education.

We measured pulmonary parenchymal tissue volume (Vt) and pulmonary capillary blood flow (Qc) in 11 normal subjects by a rebreathing technique and end-tidal, dead-space correction (ETDS) method, using two soluble gases, acetylene (C₂H₂) and dimethyl ether (DME). We assessed the results using different intervals of measurement, inspired volumes and rebreathing frequencies. The mean values ± SD of Vt were 559 ± 58 and 511 ± 52 ml, with C₂H₂ and DME, and of Qc were 3.67 ± 0.44 and 4.18 ± 0.54 liter/min/m², respectively. Measurements with the interval between the 1st and the 6th end-tidal points and within the first 15 s yielded the best reproducibility. Data obtained from two satisfactory recordings from the same subject are sufficient to calculate Vt and Qc. Inspired volume shows a significant correlation with Vt values measured with both tracer gases, especially with DME. Rebreathing frequency also affects this latter gas. Despite some problems which are not easily explainable (dependence upon the inspired volume, rebreathing frequency and test gas species), we conclude that the methods allow measurements of Vt and Qc with acceptable reproducibility but that different variables may affect the results

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