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Table 1 Demographics and characteristics of participants undergoing baseline fit testing. SD = standard deviation. KC denotes Kimberly-Clark Inc

From: 3D Printed frames to enable reuse and improve the fit of N95 and KN95 respirators

  No. (%) or Mean +/- SD (range)
Characteristic 1860 N95 respirators (n=34) 8210 N95 respirators (n=10) KC duckbill respirators (n=16) KN95 respirators (n=25)
Sex
  Female 28 (82.4%)  6 (60.0%) 14 (87.5%) 22 (88.0%)
  Male  6 (17.6%)  4 (40.0%) 2 (12.5%) 3 (12.0%)
Age  36.4 +/- 10.3  32.9 +/- 9.1 33.1 +/- 9.3 36.5 +/- 12.5
Ethnicity
  Asian/Pacific Islander  11 (32.4%) 3 (30.0%) 2 (12.5%) 5 (20.0%)
  White/Caucasian  11 (32.4%) 7 (70.0%) 3 (18.8%) 8 (32.0%)
  Black/African American  8 (23.5%) 0 (0.0%) 8 (50.0 %) 9 (36.0%)
  Hispanic/Latino  3 (8.8%) 0 (0.0%) 2 (12.5%) 3 (12.0%)
  Native American  1 (2.9%) 0 (0.0%) 1 (6.3%) 0 (0.0%)
Body mass index (BMI)  25.7 +/- 8.0 23.3 +/-2.7 30.1 +/- 10.0 26.7 +/- 8.5
Healthcare role
  Attending physician 15 (44.1%) 2 (20.0%) 1 (6.3%) 6 (24.0%)
  Resident physician or fellow 1 (2.9%) 0 (0.0%) 0 (0.0%) 2 (8.0%)
  Medical student 3 (8.8%) 3 (30.0%) 0 (0.0%) 2 (8.0%)
  Researcher 5 (14.7%) 5 (50.0%) 3 (18.8%) 1 (4.0%)
  Nurse 3 (8.8%) 0 (0.0%) 3 (18.8%) 5 (20.0%)
  Medical Assistant 5 (14.7%) 0 (0.0%) 5 (31.3%) 5 (20.0%)
  Clinic Staff 2 (5.9%) 0 (0.0%) 4 (25.0%) 4 (16.0%)
Mask size (previously fitted)
  Small  11 (32.4%)  6 (60.0%) 3 (18.8%) 6 (24.0%)
  Regular  23 (67.6%)  4 (40.0%) 13 (81.3%) 19 (76.0%)
Baseline Testing Pass Rate 30/34 (88.2%) 9/10 (90.0%) 15/16 (93.8%) 12/25 (48.0%)