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. 2013 Jan 3;3(1):e001363. doi: 10.1136/bmjopen-2012-001363

Table 2.

Table of net ingredient cost (NIC) quintile minus prevalence quintile

Difference –4 –3 –2 –1 0 1 2 3 4
Number 29 209 663 1628 3193 1456 648 217 68
Proportion 0.004 0.026 0.082 0.201 0.394 0.180 0.080 0.027 0.008

Positive (negative) differences correspond to practices whose NIC falls in a higher (lower) quintile than their reported prevalence.