I was wondering if anyone could tell me what the first mismatch number parameter means/significance? I have it highlighted in red.

Ex: 

NOWN - No ATUN log data

Test: Balance/Twist = GOOD -

Test: Brownout = FAIL - Truncated Log? Ends while armed at altitude 5.22m

Test: Compass = GOOD - mag_field interference within limits (7.94%)

Test: Dupe Log Data = GOOD -

Test: Empty = GOOD -

Test: Event/Failsafe = GOOD -

Test: GPS = GOOD -

Test: IMU Mismatch = FAIL - Check vibration or accelerometer calibration. (Mismatch: 1.97, WARN: 0.75, FAIL: 1.50)

Test: Parameters = GOOD -

Test: PM = GOOD -

Test: Pitch/Roll = GOOD -

Test: Thrust = GOOD -

Test: VCC = GOOD -