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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: J Pediatr. 2016 Sep 30;179:178–184.e4. doi: 10.1016/j.jpeds.2016.08.093

Table 2.

Observed and expected tympanostomy tube insertions, by guideline hearing threshold.

Observed3 Expected4 Observed-Expected Difference Observed-Expected per 1,000 Observed to Expected ratio
25 dB1
Total NNE 6,052 6,059 −7 − 0.01 1.00
By Payer:
 Medicaid 2,960 3,121 − 161 −0.19 0.95
 Commercial 3,092 2,938 + 154 + 0.19 1.05
Total England 66,414 123,797 − 57,383 − 3.41 0.54
20db2
Total NNE 6,052 7,963 −1,911 − 3.27 0.76
By Payer:
 Medicaid 2,960 4,102 −1,142 −1.39 0.72
 Commercial 3,092 3,861 −769 −0.93 0.80
Total England 66,414 162,705 − 96,291 − 5.82 0.41
1

Hearing threshold guideline recommended by NICE guidance in England.

2

Hearing threshold guideline recommended by AAP guidance in the US.

3

Four-year observed number of tympanostomy tubes provided in the study period. These counts are the same for both 20dB and 25 dB observed to expected ratios.

4

Four-year expected number of tympanostomy tubes provided, estimated by an epidemiological model. (See Appendix)