Table 2: Normative Fetal Heart Rate by Fetal Behavioral State:
Normative values (mean, SD, 5th and 95th percentiles) for three fetal sleep/activity states at the GA3 (34–38 weeks gestation) assessment for fetal heart rate, heart rate variability, movement, heart rate/movement cross correlation, and heart rate movement lag from cross correlation. Outlier cutoffs were set at 1.5 x IQR above the 75th or below the 25th percentile. The 5th and 95th percentiles were determined after removing outliers.
| Variable GA Age Group | n with # epochs>4 (% of participants) | low cutoff | high cutoff | percentile | ||||
|---|---|---|---|---|---|---|---|---|
| final n | % outliers | mean ± SD | 5tn | 95th | ||||
| Heart Rate (bpm) | ||||||||
| 1F | 543 (37%) | 119.6 | 149.8 | 515 | 5% | 134.8 ±6.8 | 122.7 | 145.6 |
| 2F | 1326(90%) | 122.4 | 152.9 | 1261 | 5% | 136.8 ±6.9 | 125.5 | 149.3 |
| 4F | 105(7%) | 133.7 | 172.0 | 90 | 14% | 152.0 ±8.5 | 136.7 | 166.8 |
| SD of Heart Rate (bpm) | ||||||||
| 1F | 543 (37%) | 1.1 | 3.4 | 507 | 7% | 2.1 ±0.5 | 1.3 | 3.0 |
| 2F | 1326(90%) | 2.3 | 7.2 | 1260 | 5% | 4.7 ±1.0 | 3.0 | 6.5 |
| 4F | 105(7%) | 2.0 | 8.6 | 99 | 6% | 5.3 ±1.6 | 2.6 | 7.9 |
| Fetal movement (arb units) | ||||||||
| 1F | 534 (36%) | 0.5 | 3.0 | 497 | 7% | 1.6±0.5 | 0.9 | 2.7 |
| 2F | 1304(88%) | 0.6 | 3.8 | 1232 | 5% | 2.1 ±0.7 | 1.1 | 3.4 |
| 4F | 103(7%) | 0.6 | 4.5 | 97 | 6% | 2.3 ±0.9 | 1.1 | 4.0 |
| Movement/HR Cross
correlation (no units) | ||||||||
| 1F | 57 (4%) | 0.60 | 0.93 | 54 | 5% | 0.78 ±0.07 | 0.67 | 0.89 |
| 2F | 1108(75%) | 0.62 | 0.90 | 1067 | 4% | 0.76 ±0.07 | 0.65 | 0.87 |
| 4F | 48 (3%) | 0.52 | 0.89 | 46 | 4% | 0.72 ±0.08 | 0.57 | 0.84 |
| LAG of
Movement/HR (sec) | ||||||||
| 1F | 57 (4%) | −10.6 | −0.8 | 57 | 0% | −5.6 ±2.0 | −8.6 | −3.2 |
| 2F | 1108 (75%) | −9.3 | −2.8 | 1063 | 4% | −6.0 ±1.3 | −8.3 | −3.9 |
| 4F | 48 (3%) | −10.6 | −2.95 | 45 | 6% | −6.8 ±1.8 | −10.2 | −3.7 |