Data Update

Massachusetts Data Update September 14, 2020

The trailing 7 day positivity rate for individuals newly tested edged up once again to 2.2%, the highest rate since the middle of June. However, this rate has remained constant for the past three days, perhaps indicating that the increases since the end of August might be stalling out. The overall positivity rate based on testing remains steady at 0.8%, driven by repeat testers, very few of whom are testing positive. Only 30% of tests over the past 7 days were given to individuals who haven’t been tested before.

However, the large increase in the number of repeat testers over the past month is slowing down (the widespread college testing programs are probably up to speed).  The number of first time testers actually decreased from one week ago.

Table 1: Massachusetts Testing Statistics
7 Day  Trailing Average
September 14, 2020
Testing Statistic   Current 7 Days Ago 4 Weeks Ago
Test Positivity Rate (Individuals)   2.2% 1.9% 1.7%
Test Positivity Rate (Include Suspected)   2.4% 1.9% 1.8%
Test Positivity Rate (All Tests)   0.8% 0.9% 1.4%
Test Positivity Rate (Newly Tested)   2.2% 1.9% 1.7%
Test Positivity Rate (Repeat Testers)   0.2% 0.3% 0.9%
Percentage Repeat Testers   69.4% 59.4% 31.2%
Newly Tested (Lagged 1 Week)   17,598 20,416 14,981
All Tests (Lagged 1 Week)   43,300 39,016 21,455


Hospitalization, case, and death statistics remain basically unchanged from a week or a month ago.  One encouraging sign may be a small drop in the number of intubated patients, both in absolute terms and as a percentage of patients in the ICU.

Table 2: Massachusetts Hospitalization Statistics
7 Day Trailing Averages
September 14, 2020
Hospitalization Statistic   Current 7 Days Ago 4 Weeks Ago
Covid Patients Hospitalized   328 319 389
Covid Patients in ICU   58 56 63
Covid Patients Intubed   22 26 29
New Confirmed Patients   18 21 19
Percent ICU / Hospitalized   18% 17% 16%
Percent Intubated / ICU   37% 46% 45%

I’ve added two new statistics to Table 3 so that confirmed cases and deaths can be separated from suspected cases and deaths.

Table 3: Massachusetts Reported Case and Death Statistics
7 Day  Trailing Average
September 14, 2020
Statistic   Current 7 Days Ago 4 Weeks Ago
Total Deaths Including Suspected   12 14 14
Total  Deaths Confirmed Only   12 14 13
Deaths in Long-Term Facilities (All Cases)   7 8 11
Percent from Long-Term Care   59% 56% 78%
Total Cases Including Suspected   328 331 291
Total Confirmed Cases   299 323 277

2 replies on “Massachusetts Data Update September 14, 2020”

Off topic a bit. Do you have any idea why MA tracks anti- body testing? I can understand their value if (a) they were highly accurate; and (b) there was large scale, free random testing.

But neither of those conditions apply. So what’s the point? …

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