|
|
|
front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 | 27|28 |29 |30 |31 |32 |33 |34 |35 |36 |37 |38 |39 |40 |41 |42 |43 |44 |review |
 |
III STEP:
FOLLOW-UP For 21-42 years, cohorts were followed through various sources like health records, death certificates and tumor registry. IV STEP: ANALYSIS Incidence is measured directly from the number of new cases occurred out of the total number in the cohort. Risk is measured by calculating Relative risk, cumulative risk, estimated cumulative risk and aetiological fraction. |