Park Column offices outpace a clean baseline.

The Headline

+4.3 pp

year-to-date edge in hygiene visits per hygienist-day vs a cleaned non-Park-Column baseline. The old 7.9 control was a data artifact — corrected, the cohorts are comparable.

Park Column GP, YTD (per hygienist-day)

+1.9%

5.83 to 5.94 visits per hygienist-day, year-to-date 2026 vs 2025.

Clean control: non-Park-Column GP (26)

-2.4%

Comparable offices declined over the same window. Net edge: +4.3 pp.

Reporting vs results (correlation)

-0.14

Reporting is NOT usage - this measures who sent a form, not who works the column.

What it means — in plain English

Per hygienist, Park Column offices are ahead of a cleaned, comparable baseline by +4.3 points year-to-date.

The right metric is visits per hygienist-day (matching SGA East), not per office. On that basis Park Column GP rose +1.9% YTD while comparable non-Park-Column offices declined -2.4% - a +4.3 point edge. May was about even (+0.4 pp). The rollout group is moving the right way against a market that is sliding.

Karen asked why the Park group (5.9) trailed the control (7.9). It didn't, really: one control office - Gage Dental Group - had 11,413 hygiene visits but zero hygienist-days in the PBI (a coding artifact), which inflated the control. Remove it and the control is ~6.1, right next to the Park Column's ~5.9.

Reporting is not usage - a non-reporting office may still work the column. So the flat reporting-vs-results pattern is not evidence the column is idle. This is observational; confirm with a same-ROD matched control and real usage data.

Methodology

Step-by-step

Step 1

Pull completed hygiene visits AND hygienist days worked per office from the Gen4 / SGA West PBI, for May and YTD Jan-May, 2026 vs 2025.

Step 2

Metric = completed hygiene visits (User Type = HYG) / hygienist days worked. FTE-normalized - strips out headcount changes. Matches SGA East.

Step 3

Build a baseline from Active GP West offices that never rolled out the column. Exclude Gage Dental Group (11k visits / 0 hygienist-days = data artifact).

Step 4

Compare rollout vs clean control (difference-in-differences). Cohorts now sit at comparable levels (~5.9 vs ~6.1), so the comparison is fair.

Step 5

Reporting tiers (form submissions) are shown for context only - reporting is not usage, so they are not a test of the column.

Tier breakdown

Cohorts vs baseline

Tier	Cohort	Metric
Park Column GP	47 offices	+1.9% YTD
Clean control (non-PC GP)	26 offices	-2.4% YTD
Excluded: Gage (bad data)	11k visits / 0 hyg-days	n/a

+4.3 pp difference-in-differences edge, YTD. Reporting tiers show no dose-response - but reporting is not usage, so that is not a column test.

Supporting stats

Park Column GP, YTD

+1.9%

Clean control, YTD

-2.4%

Net edge vs baseline, YTD

+4.3 pp

Net edge vs baseline, May

+0.4 pp

PC GP level (per hyg-day)

5.83 -> 5.94

Control level (clean)

6.26 -> 6.11

Reporting vs results r

-0.14 (not a usage test)

Source

Gen4 SGA West PBI

Metric is visits per hygienist-day (FTE), matching SGA East. Gage Dental Group excluded (visits with no hygienist-days). Observational - confirm with same-ROD matched control + real usage data.