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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Br J Health Psychol. 2018 Jan 31;23(2):420–435. doi: 10.1111/bjhp.12297

Table 4.

Percentage of population answering ‘don’t know’ by level of education

1993 1994 1995 1996 1997 1998 1999 2000
Education level (%)
 LEES than 9th grade 8.16 4.52 5.53 7.32 5.98 5.70 7.25 5.53
 Some high school 4.70 3.55 2.57 2.02 2.24 2.27 1.93 1.66
 High school graduate 2.73 1.75 1.61 1.27 1.37 1.07 1.18 1.16
 Some college/Tech school 1.74 1.08 1.10 0.93 0.90 0.74 0.81 0.65
 College graduate 1.27 1.04 0.99 0.92 0.68 0.57 0.65 0.71