Table 3.
NNS measurements among PROTECT infants according to sociodemographic characteristics (n = 116).
| Duration | Frequency (Hz) | Amplitude (CmH2O) | Bursts/Minute | Cycles/Burst | Cycles/Min | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N (%) | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| All Infants | 116 (100%) | 6.506 | 3.528 | 1.899 | 0.262 | 16.929 | 6.645 | 6.228 | 2.281 | 12.109 | 6.559 | 62.776 | 19.875 |
| Income (USD) | |||||||||||||
| <$20,000 | 38 (32.8%) | 6.101 | 2.738 | 1.876 | 0.251 | 17.942 | 7.132 | 6.158 | 1.886 | 11.223 | 4.987 | 61.118 | 18.092 |
| $20,000 to <$50,000 | 47 (40.5%) | 6.721 | 4.078 | 1.938 | 0.270 | 15.820 | 5.810 | 6.340 | 2.689 | 12.774 | 7.797 | 65.021 | 20.925 |
| >$50,000 | 18 (15.5%) | 7.176 | 4.077 | 1.855 | 0.271 | 17.836 | 7.06 | 5.944 | 2.162 | 12.955 | 7.074 | 62.417 | 18.708 |
| Missing | 13 (11.4%) | 5.991 | 2.682 | 1.886 | 0.262 | 16.729 | 7.549 | 6.423 | 2.080 | 11.124 | 5.038 | 60 | 23.777 |
| Maternal Education | |||||||||||||
| ≤ High School | 15 (12.9%) | 7.562 | 3.850 | 1.869 | 0.240 | 15.810 | 8.186 | 5.767 | 2.170 | 13.922 | 6.780 | 66 | 24.696 |
| Some college | 31 (26.7%) | 5.977 | 2.617 | 1.881 | 0.247 | 17.405 | 6.469 | 6.468 | 2.069 | 11.216 | 5.592 | 62.274 | 16.718 |
| Bachelor's Degree | 50 (43.1%) | 6.288 | 3.790 | 1.906 | 0.274 | 17.332 | 6.691 | 6.31 | 2.585 | 11.653 | 6.902 | 61.19 | 21.445 |
| Graduate Degree | 18 (15.5%) | 7.345 | 3.961 | 1.947 | 0.290 | 15.431 | 5.632 | 6.056 | 2.014 | 13.835 | 7.125 | 67.306 | 16.622 |
| Missing | 2 (1.7%) | ||||||||||||
| Marital Status | |||||||||||||
| Married/Cohabitating | 94 (81.0%) | 6.572 | 3.517 | 1.886 | 0.267 | 16.824 | 6.524 | 6.239 | 2.284 | 12.149 | 6.528 | 62.957 | 19.067 |
| Single | 20 (17.2%) | 6.180 | 3.815 | 1.946 | 0.244 | 17.804 | 7.508 | 6.25 | 2.403 | 11.821 | 7.139 | 62.025 | 24.642 |
| Missing | 2 (1.7%) | ||||||||||||
| Parity | |||||||||||||
| Nulliparous | 0 (0.00%) | ||||||||||||
| 1 or more children | 115 (99.1%) | 6.528 | 3.536 | 1.899 | 0.263 | 16.929 | 6.674 | 6.230 | 2.291 | 12.150 | 6.573 | 62.935 | 19.888 |
| Missing | 1 (0.9%) | ||||||||||||
| Maternal Age | |||||||||||||
| <28a | 48 (41.4%) | 6.453 | 3.300 | 1.891 | 0.261 | 17.383 | 6.854 | 6.260 | 2.224 | 12.035 | 6.194 | 65.396 | 22.034 |
| ≥28 | 68 (58.6%) | 6.544 | 3.704 | 1.904 | 0.264 | 16.609 | 6.527 | 6.206 | 2.336 | 12.162 | 6.851 | 60.926 | 18.140 |
| Birth Weight (lbs) | |||||||||||||
| <6.999b | 37 (31.9%) | 6.325 | 3.576 | 1.904 | 0.274 | 17.072 | 7.134 | 6.635 | 2.397 | 11.608 | 6.223 | 63.730 | 17.731 |
| ≥6.999 | 79 (68.1%) | 6.592 | 3.525 | 1.896 | 0.257 | 16.863 | 6.450 | 6.038 | 2.214 | 12.344 | 6.737 | 62.329 | 20.897 |
| Infant Sex | |||||||||||||
| Male | 57 (49.1%) | 6.473 | 3.399 | 1.908 | 0.260 | 16.999 | 5.944 | 6.377 | 2.145 | 11.969 | 5.840 | 64.623 | 18.486 |
| Female | 59 (50.9%) | 6.539 | 3.677 | 1.890 | 0.265 | 16.862 | 7.311 | 6.085 | 2.414 | 12.245 | 7.235 | 60.992 | 21.136 |
SD, standard deviation.
a
Median maternal age was 28 years.
b
Median birth weight was 6.999 lbs.