Subsample | household income versus household size | household electricity use versus household size | household income versus household electricity use |
High-income group in1985 | 0.101* | 0.073* | 0.279* |
High-income group in 2015 | 0.007 | 0.441* | 0.088* |
Low-income group in 1985 | 0.435* | 0.413* | 0.410* |
Low-income group in 2015 | 0.375* | 0.448* | 0.328* |