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Influence of current parental smoking on BP in preschool children (**P=0.0001, *P<0.05). The boundary of the box closest to zero indicates the 25th percentile, the line within the box marks the median, and the boundary of the box farthest from zero indicates the 75th percentile. Whiskers (error bars) above and below the box indicate the 90th and 10th percentiles. (Used with permission, Figure 1, 191.
