Vibroacoustic stimulation for fetal assessment in labour in the ...
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FUNDAMENTO: estimulação vibroacústica fetal (EVA) é uma técnica simples, ... o bem-estar fetal na presença de uma cardiotocografia nonreassuring (CTG) de ...

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Note added at 1 hr (2022-08-04 19:11:29 GMT)
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don't know what the "21" refers to though!

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Note added at 1 hr (2022-08-04 19:14:31 GMT)
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Cardiotocograph - an overview | ScienceDirect Topics
https://www.sciencedirect.com › topics › cardiotocograph
Short term variation—Short term variation (STV) examines the variability of the fetal heart rate from beat to beat, and cannot be interpreted by observer ...

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Objective: The purpose of this study was to examine the effect of vibroacoustic stimulation during low fetal heart rate (FHR) variability. Methods: FHR was analyzed 30 min before and 30 min after computerized vibroacoustic stimulation using the Oxford Sonicaid system 8000. The study comprised 32 healthy pregnant women with low antepartum FHR variability. The significance of difference of the median values was examined using Wilcoxon's matched-pairs signed-ranks test. Results: Vibroacoustic stimulation of the fetus during low FHR variability evoked a significant increase in the number of accelerations (>10 bpm) and an increase in long- and short-term variation. Conclusion: Our findings indicate that vibroacoustic stimulation during low FHR variability produces an abrupt change from a quiet to an active fetal state.

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Rhythm abnormalities of the fetus - PMC - NCBI
https://www.ncbi.nlm.nih.gov › articles › PMC2000955
by LK Hornberger · 2007 · Cited by 131 — By 20 weeks the average (SD) fetal heart rate is 140 (20) bpm with a gradual decrease to 130 (20) bpm by term. In the healthy fetus the heart

so, the only thing that relates to the number "21" (SD) is FHR

https://www.medicitalia.it/consulti/ginecologia-e-ostetricia...
[...] I risutlati sono:
Accelerazioni >15 bpm 14 – Decelerazioni minori (area 20 battiti persi) 0 / area di maggiore decelerazione (battiti persi) 9 - Episodi di alta var. (minuti) 46 ( a 28 settimane di gestazione 95,8% dei feti normali ha minore variazione) – Episodi di bassa var. (minuti) 0 – Variazione a breve termine (ms) 13,1

https://neonato.alfemminile.com/forum/neeta-para-delle-23-00...
[...]
ho notato una cosa sul risultato del tracciato che non so come prendere.
C'è un valore che si chiama EPISODI DI ALTA VARIAZIONE (Minuti) 17 e poi c'è un'annotazione "A 38 settimane di gestazione il 95,2% dei feti normali ha minore variazione"

The translation seems to be quite literal
See point 3 here:

https://www.researchgate.net/figure/The-reasons-codes-provid...