| Gestational age group | PRE-1 | PRE-2 | PRE-3 | TERM | < 28 weeks | 28 – 31+6 weeks | 32 – 36+6 weeks | ≥ 37 weeks |
| AIB (dB) | | | | | 3.5 MHz | –51.64 (–54.36, –48.22) | –50.71 (–53.62, –46.78) | –44.54 (–48.42, –40.65)ab | –41.94 (–44.95, –37.94)abc | 5.0 MHz | –55.78 (–58.61, –50.29) | –54.01 (–58.00, –49.56) | –50.84 (–54.22, –47.74)ab | –47.28 (–50.49, –44.85)abc | 7.5 MHz | –51.29 (–53.66, –49.08) | –49.60 (–51.82, –47.85) | –48.28 (–50.27, –46.09)ab | –46.74 (–48.62, –43.98)abc | SCS (MHz) | | | | | 3.5 MHz | –0.24 (–0.35, –0.10) | –0.28 (–0.40, –0.19) | –0.43 (–0.51, –0.31)ab | –0.51 (–0.61, –0.42)abc | 5.0 MHz | –0.35 (–0.50, –0.14) | –0.41 (–0.53, –0.29) | –0.63 (–0.74, –0.49)ab | –0.72 (–0.83, –0.59)abc | 7.5 MHz | –0.26 (–0.43, –0.09) | –0.43 (–0.65, –0.29) | –0.67 (–0.85, –0.50)ab | –0.81 (–1.04, –0.63)abc | CAS | | | | | 3.5 MHz | –1.87 (–2.01, –1.71) | –1.76 (–1.93, –1.54) | –1.38 (–1.57, –1.20)ab | –1.17 (–1.38, –1.03)abc | 5.0 MHz | –1.25 (–1.50, –1.10) | –1.16 (–1.36, –1.00) | –0.91 (–1.09, –0.71)ab | –0.68 (–0.86, –0.56)abc | 7.5 MHz | –3.37 (–3.61, –3.18) | –3.12 (–3.34, –2.85)a | –2.78 (–2.96, –2.53)ab | –2.51 (–2.77, –2.31)abc |
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