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Some claim that car-dependent cities contribute to obesity by discouraging walking and bicycling. In this article, we use household activity data from the San Francisco region to study the links between urban environments and nonmotorized travel. We used factor analysis to represent the urban design and land-use diversity dimensions of built environments.(More)
Note An error was discovered in the original Table 1 of this study. Notably, the Inclusive terms for the upper-nest model were incorrectly calculated thus the theta terms were in error. This revised working paper corrects this error. Also, the corrected upper nest model has a slightly different specification than originally shown in Table 1 in order to(More)
Which land-use sirategy yields greater reductions in vehicular travel: improving the proximity of jobs to housing or bringing retail and consumer services closer ro residential areas? We probe this question by examining the degree to which job accessibility is associated with reduced work travel and how closely retail and service accessibility is correlated(More)
Transit-oriented development has gained favor as a means of reducing traffic congestion, promoting affordable housing, and creating more efficient urban arrangements. Real estate markets reflect the degree to which concentrating development around transit facilities yields benefits. This study models the effects of proximity to light and commuter rail(More)
Of 103 strains of Haemophilus ducreyi isolated in Johannesburg, 96 produced beta-lactamase and were resistant to penicillin and ampicillin. Most strains showed resistance to tetracycline, sulfisoxazole, and sulfamethoxazole. All isolates were susceptible to rifampin, erythromycin, and cefoxitin, moderately susceptible to trimethoprim-sulfamethoxazole (1:19)(More)
Ulcerative balanoposthitis associated with non-syphilitic spirochaetal infection was found in 41 (12%) of 344 consecutive men with genital ulcer disease in two clinics in South Africa. All patients with non-syphilitic spirochaetal infection were uncircumcised. Non-syphilitic treponemes were seen in only two of 60 uncircumcised men who had urethritis without(More)
On the subcontinent sexually transmitted diseases present considerable diagnostic and therapeutic problems. With the recognition of vast numbers of non-gonococcal and chancroid infections, penicillin therapy is no longer adequate. This article outlines an approach to the management of urethritis and genital ulcer disease, giving suitable guidelines for the(More)