Table 4 Mixed-effects negative binomial regression estimates of between-person and within-person changes in TV viewing associated with changes in parental status and employment status over 5 years (2007/08–2011/13)

IRR (95% CI)

IRR (95% CI)

IRR (95% CI)

Change in parental status

 Between Person effects

  Never had children

Ref

  Living with children < 18 during study

0.87 (0.80, 0.94)***

0.86 (0.78, 0.93)***

−1.1%

0.84 (0.78, 0.91)***

−2.3%

Within Person effects

 Never had children

Ref

 Number of children remained unchanged

0.91 (0.84, 0.99)*

0.89 (0.82, 0.98)*

−2.2%

0.90 (0.82, 0.99)*

1.1%

 First child/ Additional children

0.90 (0.81, 1.01)

0.92 (0.83, 1.01)

2.2%

0.93 (0.83, 1.03)

1.1%

 Fewer children (aged < 18 yrs) living at home

0.99 (0.87, 1.11)

0.94 (0.83, 1.07)

−5.0%

0.96 (0.84, 1.10)

2.1%

Change in employment status

 Between Person effects

  Employed full-time during the study period

Ref

  Not employed full-time during study period

1.00 (0.96, 1.05)

0.99 (93, 1.03)

−1%

1.00 (0.95, 1.05)

1%

Within Person effects

 Remain full-time during the study period

Ref

 Remain part-time/not-working

1.07 (0.99, 1.14)

1.05 (0.98, 1.12)

−1.8%

1.07 (0.99, 1.15)

1.9%

 Increased working hours

0.99 (0.92, 1.07)

0.97 (0.90, 1.05)

−2.0%

0.99 (0.92, 1.08)

2.1%

 Reduced working hours

1.11 (1.01, 1.21)*

1.09 (1.01, 1.19)*

−1.8%

1.11 (1.03, 1.22)*

1.8%