Background
Construction and content
Design
Recruitment
Number of participants and participation rate
Baseline assessment and measures
LiKO-15 | DiaKO-19 | |
---|---|---|
Baseline assessment (conscription board examination) | ||
Personal identification number (CPR-number) | X | X |
Date and place of conscription board assessment | X | X |
Date of birth and age at examination | X | X |
Intelligence test score (BPP, full score) | X | X |
Height (cm) and weight (kg) | X | X |
Educational level at time of assessment | X | X |
Follow-up assessment | ||
Date, age at follow-up, and re-test interval | X | X |
Intelligence test score (BPP, full score and subtest scores) | X | X |
Anthropometric data | ||
- Self-reported data on height and weight | X | X |
- Measured height, weight, and waist-circumference (subsample of the DiaKO-19 participants) | X | |
Sociodemographic factors (Educational level, employment status, and type of residence) | X | X |
Social relations (Social network (children, partner, living alone), practical and emotional support, loneliness) | X | X |
Lifestyle (Alcohol consumption, dietary habits, tobacco consumption, physical activity, sleep quality, and recreational drug use) | X | X |
- More detailed information on alcohol use and misuse and recreational drug use | X | |
Health (Self-rated health, disease history, use of medication, and Major Depression Inventory) | X | X |
- Detailed information on concussions | X | X |
- Detailed information on cognitive functioning | X | X |
- Detailed information on type 2 diabetes | X | |
- Detailed information on depression | X | |
Personality | ||
- BFI-10 | X | |
- BFI, subscales of neuroticism and conscientiousness | X | |
State of mind at the follow-up examination (Recent intake of drugs or medicine and general state of mind at the follow-up examination) | X | X |
Motivation at conscription board cognitive ability testing (The extent to which the individual tried his best when completing the BPP) | X | X |
Derived measures | ||
Age-related cognitive changes | ||
- Direct measure derived by subtracting the follow-up BPP-score from the baseline BPP-score | X | X |
Follow-up in national health and administrative registries | ||
- Between baseline and follow-up | X | X |
- After the follow-up examination | X | X |
Follow-up assessment and measures
Follow-up in national administrative and health registers
Utility and discussion
Strengths and weaknesses
Generalizability
DanACo cohort | LiKO-15 study | DiaKO-19 study | |||||||
---|---|---|---|---|---|---|---|---|---|
Participants | Non-participants | P-value | Participants | Non-participants | P-value | Participants | Non-participants | P-value | |
Total, n(%) | 5340 (14.3) | 32,104* (85.7) | 2611 (13.1) | 17,277 (86.9) | 2729 (12.8) | 18,632 (87.2) | |||
Birth year, Mean(SD) | 1954.1 (3.2) | 1954.6 (3.2) | < 0.001 | 1954.4 (3.2) | 1955.0 (3.2) | < 0.001 | 1953.9 (3.1) | 1954.3 (3.1) | < 0.001 |
Conscription board examination | |||||||||
Age, Mean(SD) | 20.4 (2.1) | 20.0 (1.8) | < 0.001 | 20.3 (2.0) | 19.8 (1.7) | < 0.001 | 20.5 (2.2) | 20.0 (1.9) | < 0.001 |
BPP-score, Mean(SD) | 46.6 (9.5) | 39.8 (11.3) | < 0.001 | 46.2 (9.8) | 38.9 (11.4) | < 0.001 | 47.0 (9.3) | 40.6 (11.1) | < 0.001 |
Educational level, n(%) | < 0.001 | < 0.001 | < 0.001 | ||||||
Low | 1492 (28.0) | 15,965 (49.8) | 782 (30.0) | 9017 (52.2) | 710 (26.0) | 8904 (47.9) | |||
Medium | 1784 (33.5) | 9118 (28.4) | 871 (33.5) | 4856 (28.1) | 913 (33.5) | 5319 (28.6) | |||
High | 2053 (38.5) | 6976 (21.8) | 950 (36.5) | 3392 (19.7) | 1103 (40.5) | 4370 (23.5) | |||
Height, Mean(SD) | 179.4 (6.7) | 178.5 (7.8) | < 0.001 | 179.3 (7.1) | 178.5 (8.6) | < 0.001 | 179.5 (6.4) | 178.5 (6.6) | < 0.001 |
Weight, Mean(SD) | 69.6 (9.2) | 69.1 (11.5) | < 0.001 | 69.0 (8.9) | 68.5 (12.6) | 0.012 | 70.3 (9.5) | 69.5 (10.0) | < 0.001 |
Information from hospital registers | |||||||||
Admission to a psychiatric ward, n(%) | 112501 (21.1) | 8814 (27.5) | < 0.001 | 863 (33.1) | 8068 (46.7) | < 0.001 | 262 (9.6) | 3007 (16.1) | < 0.001 |
Charlson Comorbidity Index score, Mean(SD) | 1.0 (1.7) | 1.3 (2.0) | < 0.001 | 0.9 (1.6) | 1.3 (2.1) | < 0.001 | 1.1 (1.7) | 1.3 (1.9) | < 0.001 |