Prediction of the Normalized COVID-19 Epidemic Prevention Costs of Construction Projects Based on an Optimized Neural Network

Table 4

Statistics of the proportion of epidemic prevention costs.

Project types	Number	Average (%)	Upper confidence limit (95%)	Lower confidence limit (95%)
Buildings	36	0.18	0.28%	0.14%
Municipal engineering	12	0.07	0.15%	0.01%
Landscape greening	2	0.24	—	—
Decoration engineering	11	0.29	0.40%	0.11%
Total	61	0.18	0.23%	0.13%