The planned sample size, collected sample size, and response rate for each survey installment are as follows.
Planned Sample Size | (K-type and M-type) | Collected Sample Size | (K-type and M-type) | Response Rate | (K-type, M-type) | |
XIII（2013） | 6,400 | (3,216+3,184) | 3,170 | (1,591+1,579) | 50% | (49%, 50%) |
XII（2008） | 6,398(Note1) | (3,211+3,187) | 3,302 | (1,729+1,573) | 52% | (54%, 49%) |
XI（2003） | 4,193(Note2) | (2,088+2,105) | 2,350 | (1,192+1,158) | 56% | (57%, 55%) |
X（1998） | 4,200 | (2,075+2,125) | 2,680 | (1,339+1,341) | 64% | (65%, 63%) |
IX（1993） | 5,400 | (2,695+2,705) | 3,738 | (1,833+1,905) | 69% | (68%, 70%) |
VIII（1988） | 6,000 | (3,013+2,987) | 3,682 | (1,858+1,824) | 61% | (62%, 61%) |
VII（1983） | 6,000 | (3,067+2,933) | 4,429 | (2,256+2,173) | 74% | (74%, 74%) |
VI（1978） | 5,400 | (2,781+2,619) | 3,945 | (2,032+1,913) | 73% | (73%, 73%) |
V（1973） | 6,055 | (4,038+2,017) | 4,594 | (3,055+1,539) | 76% | (76%, 76%) |
IV（1968） | 4,000 | 3,033 | 76% | |||
III（1963） | 3,600 | 2,698 | 75% | |||
II（1958） | 2,991 | 2,369 | (Note3) | 79% | ||
I（1953） | 2,254 | 1,875 | (Note4) | 83% |
Note 1: The original planned sample size was initially 6,400; however, 2 people over 80 years of age were discovered and were then removed.
Note 2: The original planned sample size was initially 4,200; however, 7 people over 80 years of age were discovered and were then removed.
Note 3: In the 2nd installment, there were two versions of the questionnaire, a blue and white form used, with 920 and 1,449 forms returned respectively.
Note 4: The individual data for the 1st survey installment includes data from collected samples as well as those that were randomly selected as substitutes for non-response samples, for each survey location, from among collected samples. It is no longer possible to distinguish fully between the two based on the available information; as such tabulations are based on the supplemented sample size of 2,254. Additionally, the existing materials indicate somewhat different values for the actual number of collected samples, and the number thought to be the most accurate value is presented here.
Note 2: The original planned sample size was initially 4,200; however, 7 people over 80 years of age were discovered and were then removed.
Note 3: In the 2nd installment, there were two versions of the questionnaire, a blue and white form used, with 920 and 1,449 forms returned respectively.
Note 4: The individual data for the 1st survey installment includes data from collected samples as well as those that were randomly selected as substitutes for non-response samples, for each survey location, from among collected samples. It is no longer possible to distinguish fully between the two based on the available information; as such tabulations are based on the supplemented sample size of 2,254. Additionally, the existing materials indicate somewhat different values for the actual number of collected samples, and the number thought to be the most accurate value is presented here.