Clinica Zuatzu, year by year

Name: 2014–2023 series for Clinica Zuatzu in the Spanish National ART Activity Registry
Creator: Registro Nacional de Actividad 2023-Registro SEF

Everything the Spanish National Activity Registry publishes about Clinica Zuatzu between 2014 and 2023: 10 years with data. Each year carries its own attribution, because each year is a separate publication of the registry.

Volume first

Activity comes before results on purpose: a high percentage over few cycles does not mean what the same percentage over many cycles means. The registry publishes cycles as bands and that is how we show them, never reduced to a single figure; transfers are an exact count.

Transfers recorded per year — IVF/ICSI with own oocytes

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Transfers recorded per year — IVF/ICSI with own oocytes
Year	Value
2014	145
2015	177
2016	175
2017	158
2018	153
2019	173
2020	88
2021	127
2022	94
2023	123

Transfers recorded per year — Egg donation

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Transfers recorded per year — Egg donation
Year	Value
2014	66
2015	102
2016	111
2017	74
2018	89
2019	63
2020	89
2021	82
2022	50
2023	63

Results, year by year

Each band is the interval the registry published that year: the floor and the ceiling of the estimate, not a point. There is no line joining the years, and that is deliberate — joining the centres of successive intervals would assert a trend the data does not support.

IVF/ICSI with own oocytes · Under 35

Fresh embryos
Frozen embryos

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IVF/ICSI with own oocytes · Under 35
Year	Fresh embryos	Frozen embryos
2014	28.8 – 64.5%	35.4 – 82.2%
2015	19.4 – 53.9%	35.1 – 72%
2016	20.4 – 51.8%	42.8 – 80.2%
2017	27.4 – 68.2%	24.9 – 69.8%
2018	20.8 – 59.2%	19.2 – 51.4%
2019	23.2 – 66.8%	22.2 – 53.5%
2020	16 – 74.9%	34.7 – 73%
2021	21.4 – 71.9%	19.6 – 48.7%
2022	23.8 – 76.2%	36.8 – 74.3%
2023	31.9 – 80.6%	25.6 – 56.5%

IVF/ICSI with own oocytes · Between 35 and 39

Fresh embryos
Frozen embryos

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IVF/ICSI with own oocytes · Between 35 and 39
Year	Fresh embryos	Frozen embryos
2014	25.7 – 54.3%	16.5 – 50.2%
2015	30.7 – 57.7%	21.9 – 54.6%
2016	39.3 – 71.8%	15.6 – 40.4%
2017	24.9 – 54.1%	17.2 – 51.8%
2018	17.9 – 48.7%	24.6 – 66.3%
2019	20.2 – 49.8%	22.5 – 52.5%
2020	13.8 – 61.2%	18 – 53.5%
2021	7.3 – 40.7%	16.8 – 46.4%
2022	7.8 – 51.1%	4.8 – 30.5%
2023	26.3 – 69%	11.9 – 37%

IVF/ICSI with own oocytes · Over 40

Fresh embryos
Frozen embryos

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IVF/ICSI with own oocytes · Over 40
Year	Fresh embryos	Frozen embryos
2014	0 – 27.1%	0 – 71.1%
2015	8.1 – 44%	1.6 – 58.4%
2016	4.9 – 52.2%	21.7 – 78.3%
2017	19.8 – 57.2%	3 – 41.4%
2018	8.5 – 54%	0 – 23.1%
2019	0 – 20.6%	12.4 – 51.3%
2020	0 – 46.5%	—
2021	0 – 100%	0 – 71.1%
2022	—	100 – 100%
2023	0 – 100%	—

Egg donation · Under 35

Fresh embryos
Frozen embryos

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Egg donation · Under 35
Year	Fresh embryos	Frozen embryos
2014	0 – 82.9%	—
2015	17.1 – 100%	13.3 – 100%
2016	17.1 – 100%	0 – 40.2%
2017	100 – 100%	0 – 46.5%
2018	17.1 – 100%	2.5 – 64.1%
2019	0 – 46.5%	100 – 100%
2020	100 – 100%	17.1 – 100%
2021	10 – 90%	38 – 100%
2022	13.3 – 100%	0 – 46.5%
2023	—	35.2 – 92.1%

Egg donation · Between 35 and 39

Fresh embryos
Frozen embryos

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Egg donation · Between 35 and 39
Year	Fresh embryos	Frozen embryos
2014	59 – 100%	28.9 – 100%
2015	9.5 – 57.2%	26.7 – 80.9%
2016	1 – 53.6%	21.7 – 64%
2017	1 – 99%	15.4 – 84.6%
2018	6.2 – 79.5%	19 – 81%
2019	100 – 100%	29 – 96%
2020	2.5 – 64.1%	18.1 – 56.9%
2021	59.8 – 100%	12 – 76.9%
2022	0 – 100%	0 – 20.6%
2023	59.8 – 100%	11 – 47.4%

Egg donation · Over 40

Fresh embryos
Frozen embryos

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Egg donation · Over 40
Year	Fresh embryos	Frozen embryos
2014	31.8 – 72.6%	23.2 – 66.8%
2015	25.6 – 61.1%	36.5 – 69.1%
2016	40.8 – 79.2%	12.9 – 39.5%
2017	62.1 – 100%	16 – 46.8%
2018	20.4 – 61.5%	25.6 – 57.8%
2019	33.2 – 76.8%	31.8 – 72.6%
2020	26.9 – 73.1%	34 – 69.2%
2021	23.1 – 88%	30.7 – 60.2%
2022	0 – 86.7%	33.7 – 75.4%
2023	100 – 100%	7.8 – 51.1%

AIH — artificial insemination (partner’s sperm) · Under 40

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AIH — artificial insemination (partner’s sperm) · Under 40
Year	Under 40
2014	12.7 – 35.5%

AIH — artificial insemination (partner’s sperm) · Under 35

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AIH — artificial insemination (partner’s sperm) · Under 35
Year	Under 35
2015	5.1 – 26.7%
2016	6.8 – 29.6%
2017	9.9 – 30.1%
2018	9.3 – 34.6%
2019	0 – 18.9%
2020	4.5 – 28.8%
2021	6.9 – 39.3%
2022	6.9 – 39.3%
2023	1 – 24%

AIH — artificial insemination (partner’s sperm) · Between 35 and 39

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AIH — artificial insemination (partner’s sperm) · Between 35 and 39
Year	Between 35 and 39
2015	4.5 – 28.8%
2016	10.9 – 39.1%
2017	7.7 – 42.3%
2018	4.7 – 29.6%
2019	6.5 – 37.9%
2020	5.9 – 35.4%
2021	5.4 – 33.3%
2022	4.3 – 35.7%
2023	0 – 13.9%

AID — artificial insemination (donor sperm) · Under 40

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AID — artificial insemination (donor sperm) · Under 40
Year	Under 40
2014	18.6 – 52.3%

AID — artificial insemination (donor sperm) · Under 35

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AID — artificial insemination (donor sperm) · Under 35
Year	Under 35
2015	46.4 – 99%
2016	0 – 71.1%
2017	12 – 76.9%
2018	4.9 – 52.2%
2019	6.2 – 79.5%
2020	3 – 41.4%
2021	4.3 – 49%
2022	0 – 35%
2023	17.1 – 100%

AID — artificial insemination (donor sperm) · Between 35 and 39

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AID — artificial insemination (donor sperm) · Between 35 and 39
Year	Between 35 and 39
2015	5.2 – 40.2%
2016	16.3 – 56.5%
2017	3.4 – 43.7%
2018	0 – 37.9%
2019	0 – 22.2%
2020	0 – 37.9%
2021	19 – 81%
2022	0 – 20.6%
2023	0 – 35.8%

Year-by-year table

The table is the exact and complete reading: everything in the charts, and more. Each row cites the wording the registry requires for that year.

Year	Name in the registry	Cycles started	Transfers	Pregnancy per transfer (under 35)	Pregnancy per cycle (insemination)	Attribution
2014	Clinica Zuatzu	100-500	211	28.8 – 64.5%	12.7 – 35.5%	Registro Nacional de Actividad 2014-Registro SEF
2015	Clinica Zuatzu	100-500	279	19.4 – 53.9%	5.1 – 26.7%	Registro Nacional de Actividad 2015-Registro SEF
2016	Clinica Zuatzu	100-500	286	20.4 – 51.8%	6.8 – 29.6%	Registro Nacional de Actividad 2016-Registro SEF
2017	Clinica Zuatzu	100-500	232	27.4 – 68.2%	9.9 – 30.1%	Registro Nacional de Actividad 2017-Registro SEF
2018	Clinica Zuatzu	100-500	242	20.8 – 59.2%	9.3 – 34.6%	Registro Nacional de Actividad 2018-Registro SEF
2019	Clinica Zuatzu	100-500	236	23.2 – 66.8%	0 – 18.9%	Registro Nacional de Actividad 2019-Registro SEF
2020	Clinica Zuatzu	No data	177	16 – 74.9%	4.5 – 28.8%	Registro Nacional de Actividad 2020-Registro SEF
2021	Clinica Zuatzu	No data	209	21.4 – 71.9%	6.9 – 39.3%	Registro Nacional de Actividad 2021-Registro SEF
2022	Clinica Zuatzu	No data	144	23.8 – 76.2%	6.9 – 39.3%	Registro Nacional de Actividad 2022-Registro SEF
2023	Clinica Zuatzu	100-500	186	31.9 – 80.6%	1 – 24%	Registro Nacional de Actividad 2023-Registro SEF

Gaps in the series, and how to read them

The registry’s province-by-province census returns empty for 2009 and 2010, even though the individual profiles for those years do exist and have been recovered one by one. A centre missing from a given year means the registry publishes no profile for it that year — not that it closed.

The registry’s template changed schema in 2014 and again in 2015: up to 2013, cycles, implantation and transfers are published without separating fresh from frozen embryos, and insemination is published for a single age band (“under 40”). That is why some years carry fewer series than others: it is what the source published, not a missing figure.

And most important: a change from one year to the next is not, on its own, an improvement or a decline. The patient mix changes, selection criteria change and, at small volumes, chance changes too. Wide intervals are precisely the signal that the exact number cannot be trusted.

Official guide: how to interpret a centre’s data (PDF, in Spanish)

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Source: “Registro Nacional de Actividad 2023-Registro SEF” (Spanish National ART Activity Registry) — registrosef.com, retrieved 31 July 2026.