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A 2×2 table for estimating query ratio (QR), proportionality query ratio (PQR), and query log reaction score (QLRS) from Web-based query log data. Letters in the table indicate the number of people in the data who match the relevant conditions.
| Conditions | User did not query for target term | User queried for target term |
| User queried for ADRa after day 0 | e | f |
| User queried for ADR before day 0 | g | h |
aADR: adverse drug reaction.
