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Effective compression depth (mm)
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Mean (95% confidence interval)
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Source of feedback
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Anterior sensor
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Internal measure
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Difference
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Typical mattress only
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37.8 (34.1, 41.5)
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52.1 (50.1, 54.1)
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14.3 (12.0, 16.5)
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Typical mattress + backboard
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42.9 (39.5, 46.3)
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51.7 (49.8, 53.5)
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8.7 (6.5, 11.0)
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Memory foam mattress only
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41.2 (37.9, 44.4)
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54.2 (52.3, 56.1)
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13.0 (10.7, 15.3)
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Memory foam mattress + backboard
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46.3 (43.2, 49.3)
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53.7 (52.0, 55.5)
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7.5 (5.2, 9.8)
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- Presented are the mean adjusted values from a mixed effects linear model. Fixed effect: mattress type, CPR backboard use, feedback source, interaction between feedback source and mattress type, and interaction between feedback source and CPR backboard use. Random effect: intercept, mattress type, CPR backboard use, and feedback source. Goodness of fit: marginal R
2 = 0.43, conventional R
2 = 0.80
