Figure 2.3 is titled "Numbers (in Millions) of Past Year Users of Selected Hallucinogens among Persons Aged 12 or Older: 2002 and 2003." It is a bar graph, with the following note below the graph: "Statistically significant differences (at 0.05 level) between 2002 and 2003 are denoted by '+.'" The horizontal axis of the graph represents type of hallucinogen, and the vertical axis represents the number of past year users, in millions. There are four selected types of hallucinogens: Any Hallucinogen, Ecstasy, LSD, and PCP. Within each type of hallucinogen there is a bar for 2002 and a bar for 2003. For each hallucinogen and year combination, the number of past year users is as follows:
The number of past year users of any hallucinogen was 4.7 million in 2002 and 3.9 million in 2003. This is a significant difference at the 0.05 level.
The number of past year users of ecstasy was 3.2 million in 2002 and 2.1 million in 2003. This is a significant difference at the 0.05 level.
The number of past year users of LSD was 1.0 million in 2002 and 0.6 million in 2003. This is a significant difference at the 0.05 level.
The number of past year users of PCP was 0.2 million in both 2002 and 2003.