Table 1.
Characteristics of the four cohort studies in the pooled analysis of the association between consumption of fruit and vegetables and lung cancer risk
| Study | Population | Age range at base-line (years) | Year of base-line survey | Population size | Response rate (%) for baseline question-naire | Method of follow up | For present pooled analysis | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For mortality | For incidence | ||||||||||||||||||
| Age range, year | Last follow up | Mean follow up period, year | Size of cohort | Number of cancer cases | Last follow up | Mean follow up period, year | Size of cohort | Number of cancer cases | |||||||||||
| Men | Women | Men | Women | Men | Women | Men | Women | ||||||||||||
| JPHC I | Japanese residents of 5 public health-center areas in Japan | 40–59 | 1990 | 61 595 | 82 | Cancer registry and death certificate | 40–59 | 2008 | 17.8 | 20 178 | 21 657 | 262 | 66 | 2006 | 15.3 | 20 159 | 21 654 | 278 | 118 |
| JPHC II | Japanese residents of 6 public health-center areas in Japan | 40–69 | 1993–1994 | 78 825 | 80 | Cancer registry and death certificate | 40–69 | 2008 | 14.7 | 29 008 | 32 254 | 463 | 123 | 2006 | 12.1 | 28 978 | 32 241 | 503 | 152 |
| JACC | Residents of 45 areas throughout Japan | 40–79 | 1988–1990 | 110 792 | 83 | Cancer registry (selected areas: 22) and death certificate | 40–79 | 2008 | 15.8 | 23 815 | 36 434 | 543 | 179 | 2001 | 10.5 | 16 225 | 25 719 | 222 | 74 |
| MIYAGI | Residents of 14 municipalities in Miyagi Prefecture, Japan | 40–64 | 1990 | 47 605 | 92 | Cancer registry and death certificate | 40–64 | 2001 | 11.0 | 22 234 | 23 764 | 117 | 33 | 2003 | 12.8 | 22 208 | 23 756 | 297 | 98 |
| Total | 95 235 | 114 109 | 1385 | 401 | 87 570 | 103 370 | 1300 | 442 | |||||||||||
JACC, The Japan Collaborative Cohort Study; JPHC, Japan Public Health Center-based Prospective Study; MIYAGI, The Miyagi Cohort Study.