Table 5 Significant contrasts for interaction terms in models 1 to 4: Incidence rate ratios (95% confidence intervals).

Model 1

   Young children (<3 years) & old dwelling (pre-1980) versus young children & newer dwellings

2.30 (1.57 – 3.38)

   Young children (<3 years) & old dwelling (pre-1980) versus old children & newer dwellings

3.62 (2.32 – 5.64)

   Young children (<3 years) & old dwelling (pre-1980) versus old children & old dwellings

4.79 (2.59 – 8.86)

   Young children (<3 years) & newer dwelling (post-1980) versus old children & newer dwellings

1.57 (1.06 – 2.33)

   Young children (<3 years) & newer dwelling (post-1980) versus old children & old dwellings

2.08 (0.98 – 4.42)

   High level of crowding & concrete/other floor versus high crowding & tiled floor

2.52 (1.38 – 4.59)

   High level of crowding & concrete/other floor versus middle crowding & tiled floor

11.56 (1.50 – 89.3)

   High level of crowding & concrete/other floor versus low crowding & tiled floor

4.05 (1.50 – 10.9)

Model 2

   Young children (<3 years) & old dwelling (pre-1980) versus young children & newer dwellings

2.33 (1.54 – 3.53)

   Young children (<3 years) & old dwelling (pre-1980) versus old children & newer dwellings

3.41 (2.24 – 5.21)

   Young children (<3 years) & old dwelling (pre-1980) versus old children & old dwellings

5.30 (2.83 – 9.94)

   Young children (<3 years) & newer dwelling (post-1980) versus old children & newer dwellings

1.46 (0.98 – 2.18)

   Young children (<3 years) & newer dwelling (post-1980) versus old children & old dwellings

2.27 (1.12 – 4.61)

Model 3

   Young children (<3 years) & old dwelling (pre-1980) versus young children & newer dwellings

4.79 (2.48 – 9.28)

   Young children (<3 years) & old dwelling (pre-1980) versus old children & newer dwellings

7.40 (3.52 – 15.6)

   Young children (<3 years) & old dwelling (pre-1980) versus old children & old dwellings

6.39 (3.30 – 12.4)

   Young children (<3 years) & newer dwelling (post-1980) versus old children & newer dwellings

1.54 (1.04 – 2.29)

   Cleaning equip^§ missing & newer dwelling (post-1980) versus equipment missing & old dwelling

2.43 (1.16 – 5.10)

   Cleaning equip^§ missing & newer dwelling (post-1980) versus equip^§ not missing & newer dwelling

1.82 (1.18 – 2.81)

Model 4

   Carer unemployed & 3 carers in dwelling versus carer unemployed & 1 or 2 carers in dwelling

3.90 (2.45 – 6.21)

   Carer unemployed & 3 carers in dwelling versus carer employed & 1 or 2 carers in dwelling

2.09 (1.31 – 3.32)

   Carer unemployed & 3 carers in dwelling versus carer employed & 3 carers in dwelling

3.31 (1.07 – 10.2)

   Carer unemployed & 1 or 2 carers in dwelling versus carer employed & 1 or 2 carers in dwelling

0.54 (0.35 – 0.82)