Table 3.
Descriptive Statistics for Primary Study Variables, Split by Country GDP and Person-Level Characteristics
| GDP per capita | Sex at birth | Pay for own Internet | ||||
|---|---|---|---|---|---|---|
| Low GDP (n = 768) | High GDP (n = 638) | Male (n = 367) | Female (n = 1,037) | Pays (n = 624) | Does not Pay (n = 776) | |
| Variables | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) |
| Intensity | 15.15 (8.60) | 15.07 (8.75) | 16.14 (8.75)* | 14.78 (8.61) | 14.46 (8.68)* | 15.65 (8.63) |
| Breakpoint | 17.18 (27.51)* | 20.59 (26.34) | 20.53 (27.86) | 18.10 (26.73) | 19.05 (27.91) | 18.47 (26.31) |
| Omax | 29.02 (59.52) | 31.51 (58.26) | 34.69 (63.91) | 28.58 (57.09) | 32.40 (64.93) | 28.34 (53.62) |
| Elasticity | .0209 (.0227)* | .0162 (.0188) | .0170 (.0196) | .0194 (.0216) | .0200 (.0220) | .0177 (.0203) |
| Delay discounting | .57 (.27)* | .48 (.25) | .54 (.27) | .53 (.26) | .56 (.25)* | .51 (.27) |
| Activity engagement | 3.81 (1.75)* | 4.17 (1.65) | 3.98 (1.81) | 3.97 (1.69) | 3.91 (1.78) | 4.02 (1.66) |
| Parent income level | ||||
|---|---|---|---|---|
| Less than $25,000 (n = 311) | $25,000–$100,000 (n = 744) | Greater than $100,000 (n = 317) | F-value (df), p value | |
| Intensity | 15.07 (8.58) | 15.03 (8.69) | 15.19 (8.66) | .04 (2, 1,369), .96 |
| Breakpoint | 14.44 (24.00) | 18.93 (27.41) | 22.95 (28.85) | 7.80 (2, 1,369), < .001 |
| Omax | 23.66 (51.61) | 31.81 (61.72) | 33.06 (59.68) | 2.55 (2, 1,369), .08 |
| Elasticity | .0232 (.0251) | .0181 (.0195) | .0163 (.0205) | 9.30 (2, 1,323), < .001 |
| Delay discounting | .57 (.29) | .53 (.25) | .48 (.26) | 9.61 (2, 1,358), < .001 |
| Activity engagement | 3.91 (1.87) | 3.96 (1.63) | 4.03 (1.76) | .42 (1,377), .66 |
Note. GDP categories were determined by grouping the lowest three and highest three GDP per capita countries together. India (GDP per capita = $2,104), Malaysia (GDP per capita = $11,072) and Argentina (GDP per capita = $11,658) were placed in the low-GDP group, while the United Kingdom (GDP per capita = $42,580), the United States (GDP per capita = $54,542), and Australia (GPD per capita = $56,420) were placed in the high-GDP group.
* =
significant difference between groups.