Table 1
Cohort characteristics, opioid-naïve children (aged 1 to 24 years) of opioid-naïve mothers who underwent surgery in Ontario, Canada, July 2013 to March 2017


Table 1
Cohort characteristics, opioid-naïve children (aged 1 to 24 years) of opioid-naïve mothers who underwent surgery in Ontario, Canada, July 2013 to March 2017
Table summary
This table displays the results of Cohort characteristics. The information is grouped by Characteristic (appearing as row headers), Total/overall
(n=283,550), Mother filled postoperative opioid prescription
(n=171,139), Mother did not fill postoperative opioid prescription
(n=112,411) and P-value, calculated using mean , standard deviation, p-value, number, percent and percent units of measure (appearing as column headers).
Characteristic Total/overall
(n=283,550)		 Mother filled postoperative opioid prescription
(n=171,139)		 Mother did not fill postoperative opioid prescription
(n=112,411)		 P-valueTable 1 Note ‡
mean standard deviation mean standard deviation mean standard deviation p-valueTable 1 Note ‡
Age, child, years 10.6 6.6 11.0 6.8 10.0 6.8 <0.001
Age, mother, years 40.2 8.3 40.7 8.2 39.4 8.4 <0.001
number percent number percent number percent p-valueTable 1 Note ‡
Sex, male 146,951 51.8 88,505 51.7 58,446 52.0 0.15
Residence
Rural 38,571 13.6 22,480 13.1 16,091 14.3 <0.001
Non-rural 244,979 86.4 148,659 86.9 96,320 85.7 N/A
Neighbourhood income quintile
First (lowest) 49,852 17.6 28,307 16.5 21,545 19.2 <0.001
Second 51,700 18.2 30,502 17.8 21,198 18.9 N/A
Third 57,094 20.1 34,490 20.2 22,604 20.1 N/A
Fourth 64,581 22.8 39,998 23.4 24,583 21.9 N/A
Fifth (highest) 57,930 20.4 36,559 21.4 21,371 19.0 N/A
Missing 2,393 0.8 1,283 0.7 1,110 1.0 N/A
Note ‡

chi-square (categorical) or t-tests (means)

Return to note ‡ referrer

Note: N/A stands for not applicable (single p-value is reported from chi-square test of cross-tabulated categorical variables).
Sources: 1. Inpatient admissions (Discharge Abstract Database), 2. Same-day surgical procedures (Same Day Surgery Database), 3. Opioid prescriptions (Narcotics Monitoring System), 4. Emergency department presentations (National Ambulatory Care Reporting System), 5. Deaths (Office of the Registrar General – Deaths) and individual-level demographic information (Registered Persons Database), 6. Mother–baby linked database (ICES-derived MOMBABY database).

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