Table 4 Incidence Rate Ratios (IRR) for number of recent days with poor physical health

Caregiving

Caregiver

No

1

1

1

1

1

Yes

1.14** (1.11 to 1.16)

1.09** (1.06 to 1.11)

1.06** (1.03 to 1.08)

1.05** (1.02 to 1.07)

1.03* (1.01 to 1.06)

Demographic

Gender^a

Male

1

1

1

1

1

Female

1.24** (1.22 to 1.26)

1.29** (1.27 to 1.31)

1.27** (1.26 to 1.29)

1.29** (1.27 to 1.31)

1.27** (1.25 to 1.29)

Age

1.01** (1.01 to 1.01)

1.01** (1.01 to 0.01)

1.01** (1.01 to 1.01)

1.01** (1.01 to 1.01)

0.99** (0.99 to 0.99)

Education level^b

University

1

1

1

1

1

Secondary school or equal

1.21** (1.19 to 1.24)

1.27** (1.24 to 1.30)

1.23** (1.20 to 1.26)

1.22** (1.20 to 1.25)

1.17 (1.14 to 1.19)

Compulsory school

1.65* (1.62 to 1.68)

1.61** (1.58 to 1.64)

1.55** (1.52 to 1.56)

1.54** (1.51 to 1.57)

1.43 (1.40 to 1.46)

Socioeconomic

Financial status^c

No problems

1

1

1

1

Have problems

1.50** (1.47 to 1.53)

1.62** (1.58 to 1.65)

1.54** (1.51 to 1.58)

1.33** (1.30 to 1.36)

Social support

Emotional social support^d

Yes

1

1

1

No

1.40** (1.37 to 1.43)

1.24** (1.21 to 1.27)

1.19** (1.16 to 1.22)

Instrumental social support^d

Yes

1

1

1

No

1.62** (1.57 to 1.67)

1.29** (1.24 to 1.34)

1.24** (1.20 to 1.29)

Illness

Long-term illness^e

No

1

1

Yes

3.29** (3.24 to 3.34)

3.10** (3.05 to 3.15)