Everything the Spanish National Activity Registry publishes about Clínica Nida between 2018 and 2023: 6 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 oocytesSee this chart’s data
Transfers recorded per year — IVF/ICSI with own oocytes
Year
Value
2018
173
2019
205
2020
201
2021
203
2022
151
2023
130
Transfers recorded per year — Egg donationSee this chart’s data
Transfers recorded per year — Egg donation
Year
Value
2018
63
2019
115
2020
110
2021
117
2022
96
2023
94
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
See this chart’s data
IVF/ICSI with own oocytes · Under 35
Year
Fresh embryos
Frozen embryos
2018
35.9 – 97.5%
51.5 – 92.9%
2019
0 – 55.1%
56 – 91.9%
2020
0 – 67.4%
36.3 – 76.8%
2021
29 – 96%
47.8 – 85.5%
2022
1 – 99%
55 – 86.9%
2023
13.3 – 100%
67.4 – 100%
IVF/ICSI with own oocytes · Between 35 and 39
Fresh embryos
Frozen embryos
See this chart’s data
IVF/ICSI with own oocytes · Between 35 and 39
Year
Fresh embryos
Frozen embryos
2018
26.6 – 60.9%
26.4 – 57.8%
2019
30.3 – 63.8%
35 – 63%
2020
23.2 – 53.7%
34.6 – 63.2%
2021
35.2 – 67.5%
38.2 – 69.5%
2022
15.2 – 58.5%
52.4 – 79.5%
2023
14.5 – 52.2%
48.3 – 77.2%
IVF/ICSI with own oocytes · Over 40
Fresh embryos
Frozen embryos
See this chart’s data
IVF/ICSI with own oocytes · Over 40
Year
Fresh embryos
Frozen embryos
2018
13.3 – 40.4%
21.1 – 53.2%
2019
16.7 – 42.9%
28.4 – 56.7%
2020
14.1 – 40.4%
30.7 – 60.2%
2021
11.6 – 38.4%
10.9 – 32.7%
2022
0 – 29.3%
3.5 – 31%
2023
6 – 44%
13 – 48.5%
Egg donation · Under 35See this chart’s data
Egg donation · Under 35
Year
Frozen embryos
2019
0 – 86.7%
2020
100 – 100%
2022
100 – 100%
2023
100 – 100%
Egg donation · Between 35 and 39See this chart’s data
Egg donation · Between 35 and 39
Year
Frozen embryos
2018
16 – 74.9%
2019
38.6 – 78.1%
2020
44.1 – 85.9%
2021
54 – 99.8%
2022
67.4 – 100%
2023
47.8 – 95.1%
Egg donation · Over 40
Fresh embryos
Frozen embryos
See this chart’s data
Egg donation · Over 40
Year
Fresh embryos
Frozen embryos
2018
—
51.6 – 77.8%
2019
—
54.8 – 74.8%
2020
—
48.2 – 68.7%
2021
0 – 100%
63.9 – 81.2%
2022
—
54.5 – 75.5%
2023
—
59 – 79.5%
AIH — artificial insemination (partner’s sperm) · Under 35See this chart’s data
AIH — artificial insemination (partner’s sperm) · Under 35
Year
Under 35
2019
6.7 – 60%
2021
0 – 46.5%
2022
100 – 100%
2023
0 – 40.2%
AIH — artificial insemination (partner’s sperm) · Between 35 and 39See this chart’s data
AIH — artificial insemination (partner’s sperm) · Between 35 and 39
Year
Between 35 and 39
2019
3.4 – 43.7%
2020
0 – 31.6%
2022
0 – 46.5%
2023
0 – 86.7%
AID — artificial insemination (donor sperm) · Under 35See this chart’s data
AID — artificial insemination (donor sperm) · Under 35
Year
Under 35
2021
0 – 26.1%
2022
0 – 31.6%
AID — artificial insemination (donor sperm) · Between 35 and 39See this chart’s data
AID — artificial insemination (donor sperm) · Between 35 and 39
Year
Between 35 and 39
2019
0 – 82.9%
2020
0 – 32.6%
2021
0 – 32.6%
2022
0 – 22.2%
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
2018
Clínica Nida
100-500
236
35.9 – 97.5%
No data
Registro Nacional de Actividad 2018-Registro SEF
2019
Clínica Nida
100-500
320
0 – 55.1%
6.7 – 60%
Registro Nacional de Actividad 2019-Registro SEF
2020
Clínica Nida
100-500
311
0 – 67.4%
0 – 31.6%
Registro Nacional de Actividad 2020-Registro SEF
2021
Clínica Nida
100-500
320
29 – 96%
0 – 46.5%
Registro Nacional de Actividad 2021-Registro SEF
2022
Clínica Nida
100-500
247
1 – 99%
100 – 100%
Registro Nacional de Actividad 2022-Registro SEF
2023
Clínica Nida
100-500
224
13.3 – 100%
0 – 40.2%
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.
