Table 2.
Effects of adjustment for perceived home availability of energy-dense snack foods on the association between TV viewing and adolescent energy-dense snack consumption among Australian adolescents in 2004–2005 (n 2984)
| τ | se | τ′ | se | τ−τ′ | se | t | P value | R 2 | |
|---|---|---|---|---|---|---|---|---|---|
| Adolescent boys (n 1390) | |||||||||
| School-day TV viewing | 0·003*** | 0·0004 | 0·002*** | 0·0003 | 0·001 | 0·0000025 | 7·94 | <0·0001 | 0·19 |
| Weekend-day TV viewing | 0·003*** | 0·0005 | 0·001*** | 0·0004 | 0·002 | 0·0000041 | 13·58 | <0·0001 | 0·18 |
| Adolescent girls (n 1594) | |||||||||
| School-day TV viewing | 0·003*** | 0·0003 | 0·001*** | 0·0003 | 0·002 | 0·0000011 | 9·87 | <0·0001 | 0·23 |
| Weekend-day TV viewing | 0·003*** | 0·0005 | 0·001*** | 0·0003 | 0·002 | 0·0000034 | 9·06 | <0·0001 | 0·22 |
TV, television.
τ, unstandardised regression coefficient for association between TV viewing and adolescent energy-dense snack food consumption, adjusting for school year and accounting for potential clustering by school (unit of analyses) using the ‘cluster’ command, before adjustment for mediator; τ′, unstandardised regression coefficient for association between TV viewing and adolescent energy-dense snack food consumption, adjusting for year level and accounting for potential clustering by school (unit of analyses) using the ‘cluster’ command and mediator (perceived home availability of energy-dense snack foods); τ−τ′, difference between the two regression coefficients, which when divided by its se, can be compared with a t distribution with n – 2 degrees of freedom.
Significance of the association: ***P < 0·001.