Table 1.
Frequency distributions of potential predictors of type of material used*
| Variable | Number | Percent | |
|---|---|---|---|
| Regional Participation | |||
| Practitioner-Investigators, by DPBRN region | |||
| AL/MS | 63 | 35 | |
| FL/GA | 37 | 20 | |
| MN | 31 | 17 | |
| PDA | 51 | 28 | |
| Total | 182 | ||
| Restorations, by DPBRN Region | |||
| AL/MS | 1834 | 33 | |
| FL/GA | 1068 | 19 | |
| MN | 1076 | 19 | |
| PDA | 1621 | 29 | |
| Total | 5599 | ||
| Patients, by DPBRN Region | |||
| AL/MS | 1077 | 31 | |
| FL/GA | 693 | 20 | |
| MN | 712 | 21 | |
| PDA | 939 | 27 | |
| Total | 3421 | ||
| Practitioner and Practice Characteristics | |||
| Gender | |||
| Male | 147 | 81 | |
| Female | 35 | 19 | |
| Total | 182 | ||
| Years Since Graduation | |||
| ≤ 5 | 25 | 14 | |
| 6-15 | 35 | 20 | |
| 16-19 | 29 | 17 | |
| 20 or more | 86 | 49 | |
| Missing | 7 | -- | |
| Total | 182 | ||
| Type of Practice | |||
| Large group practice (4 or more practitioners) | 79 | 43 | |
| Small group practice (3 or fewer practitioners) | 101 | 56 | |
| Public health practice | 2 | 1 | |
| Total | 182 | ||
| Practice Workload | |||
| Too busy to treat all | 17 | 10 | |
| Provided care to all, but overburdened | 31 | 18 | |
| Provided care to all, but not overburdened | 101 | 58 | |
| Not busy enough | 26 | 15 | |
| Missing | 7 | -- | |
| Total | 182 | ||
| Patient Characteristics | |||
| Gender | |||
| Male | 1564 | 46 | |
| Female | 1850 | 54 | |
| Missing | 7 | -- | |
| Total | 3421 | ||
| Race | |||
| White or Caucasian | 2561 | 82 | |
| Black or African-American | 398 | 13 | |
| Other (American Indian/Alaska Native/ Asian/ Pacific Islander) |
179 | 6 | |
| Missing | 283 | -- | |
| Total | 3421 | ||
| Hispanic or Latino Ethnicity | |||
| Hispanic or Latino | 205 | 6 | |
| Not Hispanic or Latino | 2983 | 94 | |
| Missing | 233 | ||
| Total | 3421 | ||
| Mean (SD) Age in years (n = 3407) | 31.1 (16.4) | ||
| Dental Insurance | |||
| Yes | 2859 | 84 | |
| No | 553 | 16 | |
| Missing | 9 | -- | |
| Total | 3421 | ||
| Caries Lesion Characteristics | |||
| Tooth Location | |||
| Molar | 3886 | 69 | |
| Premolar | 1713 | 31 | |
| Total | 5599 | ||
| Tooth Surface | |||
| Posterior multi-surface | 1927 | 34 | |
| Posterior one surface | 3672 | 66 | |
| occlusal | 1866 | 51† | |
| mesial or distal | 1016 | 28† | |
| buccal or lingual | 790 | 22† | |
| Depth estimated pre-operatively | |||
| E1, outer ½ enamel | 211 | 4 | |
| E2, inner ½ enamel | 629 | 11 | |
| D1, outer ⅓ dentin | 2997 | 54 | |
| D2, middle ⅓ dentin | 1314 | 24 | |
| D3, inner ⅓ dentin | 351 | 6 | |
| Uncertain | 32 | 1 | |
| Missing | 65 | -- | |
| Total | 5599 | ||
| Depth as determined post-operatively | |||
| E1, outer ½ enamel | 127 | 2 | |
| E2, inner ½ enamel | 442 | 8 | |
| D1, outer ⅓ dentin | 2468 | 44 | |
| D2, middle ⅓ dentin | 1823 | 33 | |
| D3, inner ⅓ dentin | 705 | 13 | |
| Missing | 34 | -- | |
| Total | 5599 | ||
*
Includes restorations using amalgam or RBC only
†
Percentages of 3672 posterior one-surface restorations