Research interest in this issue was stronger in the European countries than in other regions. Of the 165 observations in the EE sample, 124 were located in Europe, 30 were located in North and South America and Oceania, and 11 were located in Asia and Central America. Of the 195 observations in the GHGE sample, 162 were located in Europe, 24 were located in North and South America and Oceania, and 9 were located in Asia and Central America.
4.1. Meta-analysis results for EE
Although several authors used both EE and GHGE, it is more meaningful to examine these environmental effect measures separately. Thus, we performed a logistic regression analysis to determine the effect of the structural variables on the EE benefits of organic farming.
Table 3 presents the frequency distributions of the structural and outcome variables in the studies that use EE as an effect measure. In these studies, 67.3% of the 165 observations exhibited positive outcomes, and 32.3% exhibited neutral or negative outcomes. That is, in terms of EE, organic farming was favored over conventional farming. For the EE comparisons, 45% involved field crops and 66% of the comparisons involved farm sizes over 10 ha.
Research interest in this issue was stronger in the European countries than in other regions. Of the 165 observations in the EE sample, 124 were located in Europe, 30 were located in North and South America and Oceania, and 11 were located in Asia and Central America. Of the 195 observations in the GHGE sample, 162 were located in Europe, 24 were located in North and South America and Oceania, and 9 were located in Asia and Central America.4.1. Meta-analysis results for EEAlthough several authors used both EE and GHGE, it is more meaningful to examine these environmental effect measures separately. Thus, we performed a logistic regression analysis to determine the effect of the structural variables on the EE benefits of organic farming.Table 3 presents the frequency distributions of the structural and outcome variables in the studies that use EE as an effect measure. In these studies, 67.3% of the 165 observations exhibited positive outcomes, and 32.3% exhibited neutral or negative outcomes. That is, in terms of EE, organic farming was favored over conventional farming. For the EE comparisons, 45% involved field crops and 66% of the comparisons involved farm sizes over 10 ha.
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