Adults, Y Fan, Wales, Elwood and 1976 mean age 18.7 - - UK Toothill 1986 58 yrs Adults, Ruthin, Wales, Elwood and 1976 mean age 17.9 - - UK Toothill 1986 58 yrs 16.8 Adults (M)f 1975 Germany - - Müller 1992 (unknown) 13.2 (F)f Fontana, Mothers Wei Liang et al. 1975 18 - - California, USA (41) 1977 Fontana, Adults Wei Liang et al. 1975 20 - - California, USA yrs (36) 1977 Fontana, Adults Wei Liang et al. 1975 17 - - California, USA yrs (29) 1977 Fontana, Adults >81 Wei Liang et al. 1975 16 - - California, USA yrs (21) 1977 Adult females Houston, Johnson et al. 1975 living close 12.9 - - USA 1975b to freeway (unknown) Adult females Houston, Texas, living away Johnson et al. 1975 11.9 - - USA from 1975b freeway (unknown) Adult Houston, orderlies & Johnson et al. 1975 21.3 - - USA custodians 1975b (unknown) office Houston, Texas, Johnson et al. 1975 workers 18.4 - - USA 1975b (unknown) 11.8 10.9 Lancaster, Adults Johnson et al. 1974 (M) (M) - California, USA yrs (45) 1975a 9.1(F) 8(F) 11.1 Lancaster, Adults >35 13 (M) Johnson et al. 1974 (M) - California, USA yrs (41) 9.3(F) 1975a 8.7(F) 16.6 15.1 Los Angeles, Adults (M) (M) Johnson et al. 1974 - California, USA yrs (73) 12.9 11.8 1975a (F) (F) 18.5 17.1 Los Angeles, Adults >35 (M) (M) Johnson et al. 1974 - California, USA yrs (18) 14.7 13.4 1975a (F) (F) Ann Arbor, Adults Hecker et al. 1974 14.6 - - Michigan, USA (unknown) 1974 Hartford, Adults Osbourne et al. 1973 15.9 - - Connecticut,USA (unknown) 1976
1976 Y Fan, Wales, UK Adults, mean age 58 yrs 18.7 - - Elwood and Toothill 1986 1976 Ruthin, Wales, UK Adults, mean age 58 yrs 17.9 - - Elwood and Toothill 1986 1975 Germany Adults (unknown) 16.8 (M)f 13.2 (F)f - - Müller 1992 1975 Fontana, California, USA Mothers (41) 18 - - Wei Liang et al. 1977 1975 Fontana, California, USA Adults yrs (36) 20 - - Wei Liang et al. 1977 1975 Fontana, California, USA Adults yrs (29) 17 - - Wei Liang et al. 1977 1975 Fontana, California, USA Adults >81 yrs (21) 16 - - Wei Liang et al. 1977 1975 Houston, USA Adult females living close to freeway (unknown) 12.9 - - Johnson et al. 1975b 1975 Houston, Texas, USA Adult females living away from freeway (unknown) 11.9 - - Johnson et al. 1975b 1975 Houston, USA Adult orderlies & custodians (unknown) 21.3 - - Johnson et al. 1975b 1975 Houston, Texas, USA office workers (unknown) 18.4 - - Johnson et al. 1975b 1974 Lancaster, California, USA Adults yrs (45) 11.8 (M) 9.1(F) 10.9 (M) 8(F) - Johnson et al. 1975a 1974 Lancaster, California, USA Adults >35 yrs (41) 13 (M) 9.3(F) 11.1 (M) 8.7(F) - Johnson et al. 1975a 1974 Los Angeles, California, USA Adults yrs (73) 16.6 (M) 12.9 (F) 15.1 (M) 11.8 (F) - Johnson et al. 1975a 1974 Los Angeles, California, USA Adults >35 yrs (18) 18.5 (M) 14.7 (F) 17.1 (M) 13.4 (F) - Johnson et al. 1975a 1974 Ann Arbor, Michigan, USA Adults (unknown) 14.6 - - Hecker et al. 1974 1973 Hartford, Connecticut,USA Adults (unknown) 15.9 - - Osbourne et al. 1976