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. 2011 Sep;30(5):1113–1123. doi: 10.1016/j.jhealeco.2011.07.004

Table 1.

Reasons for sample attrition in 2004 and descriptive statistics for each group in 1999.

Interview status in 2004 Number in each category
Mean health 1999
Mean income 1999 (£,000s)
Mean age 1999
Scotland England & Wales Scotland England & Wales Scotland England & Wales Scotland England & Wales
Males
Full interview in 2004 892 (64.9%) 3391 (70.5%) 0.83 (0.12) 0.83 (0.11) 23.8 (24.1) 24.5 (20.5) 44.4 (16.6) 44.6 (16.9)



Dead 69 (5.0%) 234 (4.9%) 0.71 (0.17) 0.70 (0.16) 15.3 (11.2) 16.4 (10.6) 71.3 (12.5) 71.0 (14.0)
Full interview in 2004 (no health data) 12 (0.9%) 44 (0.9%) 0.81 (0.12) 0.80 (0.15) 29.9 (25.0) 23.8 (18.6) 47.3 (16.8) 57.5 (19.7)
Proxy interview 10 (0.7%) 62 (1.3%) 0.86 (0.12) 0.79 (0.16) 28.7 (17.7) 22.3 (21.3) 40.8 (11.6) 44.6 (19.3)
Telephone interview 74 (5.4%) 169 (3.5%) 0.81 (0.14) 0.84 (0.11) 23.3 (13.7) 23.8 (14.6) 43.7 (14.4) 42.0 (17.1)
Refusal 86 (6.3%) 212 (4.4%) 0.84 (0.11) 0.82 (0.13) 21.4 (13.7) 20.0 (12.5) 43.0 (18.5) 41.0 (17.9)
Other non-interview 12 (0.9%) 41 (0.9%) 0.87 (0.06) 0.84 (0.13) 24.4 (16.6) 16.7 (9.1) 28.8 (15.2) 31.8 (13.6)
Age, infirmity or disability 5 (0.4%) 13 (0.3%) 0.61 (0.19) 0.67 (0.13) 13.4 (4.1) 13.2 (10.8) 69.4 (9.9) 72.0 (15.4)
Non-contact 100 (7.3%) 242 (5.0%) 0.81 (0.13) 0.82 (0.14) 17.2 (13.3) 21.0 (17.2) 31.1 (13.2) 32.7 (12.9)
Out-of-scope 34 (2.5%) 83 (1.7%) 0.84 (0.10) 0.86 (0.10) 25.3 (16.8) 26.8 (16.2) 35.8 (13.6) 35.9 (13.4)
Institutionalised 3 (0.2%) 10 (0.2%) 0.77 (0.19) 0.67 (0.11) 14.5 (5.0) 14.3 (12.3) 57.0 (31.2) 73.2 (8.2)
Isolated temporary sample member 14 (1.0%) 155 (3.2%) 0.84 (0.11) 0.82 (0.12) 20.4 (19.8) 31.2 (39.4) 34.6 (10.6) 34.3 (13.9)
Adamant refusal at previous wave 61 (4.4%) 145 (3.0%) 0.85 (0.11) 0.81 (0.15) 24.1 (13.4) 23.6 (18.1) 44.7 (16.5) 43.9 (18.6)
Long-term untraced or withdrawn 3 (0.2%) 8 (0.2%) 0.88 (0.08) 0.86 (0.03) 12.9 (9.5) 29.6 (15.7) 42.0 (12.5) 31.6 (7.3)



Total with health data in 1999 1375 4809



Females
Full interview in 2004 1129 (65.0%) 4122 (73.6%) 0.80 (0.13) 0.79 (0.13) 22.1 (23.9) 22.5 (21.8) 44.7 (17.1) 45.5 (17.4)



Dead 85 (4.9%) 241 (4.3%) 0.63 (0.16) 0.64 (0.16) 14.0 (12.0) 14.1 (9.8) 74.2 (12.5) 75.5 (12.4)
Full interview in 2004 (no health data) 6 (0.3%) 49 (0.9%) 0.82 (0.09) 0.75 (0.16) 16.2 (13.0) 22.4 (12.5) 61.3 (13.0) 52.1 (15.9)
Proxy interview 4 (0.2%) 26 (0.5%) 0.77 (0.10) 0.77 (0.16) 24.7 (12.2) 17.6 (11.3) 41.8 (26.0) 53.1 (22.9)
Telephone interview 79 (4.6%) 211 (3.8%) 0.79 (0.13) 0.81 (0.12) 20.0 (12.3) 22.9 (21.5) 46.8 (15.2) 42.5 (15.6)
Refusal 110 (6.3%) 215 (3.8%) 0.80 (0.14) 0.79 (0.14) 19.3 (12.3) 19.2 (13.8) 44.1 (18.8) 42.1 (19.6)
Other non-interview 23 (1.3%) 39 (0.7%) 0.79 (0.13) 0.78 (0.13) 23.9 (21.2) 18.6 (13.1) 38.0 (19.7) 43.1 (20.8)
Age, infirmity or disability 8 (0.5%) 40 (0.7%) 0.67 (0.18) 0.66 (0.16) 8.4 (4.4) 12.1 (8.2) 70.6 (12.0) 79.4 (9.4)
Non-contact 154 (8.9%) 189 (3.4%) 0.79 (0.13) 0.79 (0.14) 17.0 (13.6) 17.8 (15.8) 29.5 (10.8) 33.0 (14.8)
Out-of-scope 39 (2.2%) 107 (1.9%) 0.84 (0.14) 0.83 (0.11) 22.5 (15.4) 26.4 (16.8) 36.4 (15.2) 34.8 (15.0)
Institutionalised 2 (0.1%) 10 (0.2%) 0.75 (0.12) 0.72 (0.13) 9.2 (0.25) 15.0 (13.3) 77.5 (3.5) 73.8 (19.7)
Isolated temporary sample member 10 (0.6%) 159 (2.8%) 0.78 (0.13) 0.79 (0.12) 15.9 (9.3) 24.3 (23.1) 32.5 (12.8) 33.8 (16.2)
Adamant refusal at previous wave 84 (4.8%) 183 (3.3%) 0.82 (0.13) 0.80 (0.14) 24.6 (16.1) 22.8 (21.0) 44.2 (17.4) 48.4 (19.3)
Long-term untraced or withdrawn 3 (0.2%) 7 (0.1%) 0.88 (0.02) 0.73 (0.14) 11.4 (10.9) 24.4 (20.8) 39.3 (8.4) 33 (14.7)



Total with health data in 1999 1736 5598

Un-weighted statistics. Standard deviations in brackets for health, income and age.