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Freedom of Information Team

Tavistock and Portman NHS Foundation Trust

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Dear Leo

Your request for information, as detailed in your email below, has been
handled under the Freedom of Information Act 2000 (FOIA). Please find
attached our response, as a csv file, which has also been pasted below in
text format, for our own ease of reference.

Your Questions:

please provide the following information regarding the ages of patients
referred to the Gender Identity Development Service (GIDS):

 1. Please provide these data for each individual GIDS clinic separately
and for the service as a whole (GIDS-wide). Please provide these data
separately for patients assigned male at birth and those assigned
female at birth, and in combination regardless of sex assigned at
birth, at both the GIDS-wide and individual clinic level.
 2. For each financial year in which data are held, please provide the
following statistics on the ages of referred patients:

1.      Mean

2.      Mode

3.      Standard deviation

4.      Skewness (per the SKEW function in Excel)

5.      Kurtosis (per the KURT function in Excel)

6.      Minimum

7.      Maximum

8.      First quartile (Q1)

9.      Median

10.   Third quartile (Q3)

11.   Interquartile range (IQR)

Explanatory Notes about our response:

 A. The Tavistock and Portman NHS Foundation Trust did not hold data by
GIDS clinic location, as the GIDS did not differentiate its data by
clinic location. GIDS service provision was nationwide and managed as
one service with one waiting list. Individual clinicians would cover
several GIDS clinic locations
 B. The Trust holds GIDS Referral and GIDS Waiting List data from
Financial Year 2001/02 to 2022/23, with the following *exceptions:

•    From July 2021: GIDS referrals from General Practitioners and other
non-CAMHS/paediatric referrers were handled by Arden and GEM CSU on behalf
of NHS England

•    From October 2022 all new referrals from any referrer were redirected
to Arden & GEM CSU.

•    From 23 March 2023, The whole GIDS waiting list and all new referrals
were managed by Arden and GEM. GIDS no longer held or managed the waiting
list for GIDS, the Children and Young People’s Gender Dysphoria Services.

•    NHSE/I are now the data controllers for the AGEM Referral Hub. Should
you wish to contact them directly to learn more about the
referrals/waiting list that they hold, the relevant email address is
[1][email address]

 C. We note your request that the data be provided in Excel format,
however it has been provided as a csv file, in line with guidance
issued by the Information Commissioner’s Office in order to mitigate
risk to personal information. This Trust no longer provides data as
excel spreadsheets/workbooks.

RESPONSE DATA:

Please note that:

• The following data supplied has been based on patient age at time that
referral was received
• The errors indicated as "#DIV/0!" and "#N/A" denote where it was not
possible to calculate measure based on given backing data

All 1. 2. 3. Std 4. 5. 6. 7. 8. 9. 10. 11.
Genders deviation Skewness Kurtosis Interquartile
Mean Mode (per the (per the Min Max First Median Third range (IQR)
SKEW KURT quartile quartile
function function (Q1) (Q3)
in in
Excel) Excel)
2001/02 5.00 #N/A 0.00 #DIV/0! #DIV/0! 5 5 5 5 5 0
2002/03 9.75 #N/A 1.92 -0.48 -1.70 12 7 8.5 10 11.25 2.75
2003/04 8.67 11.00 3.30 -1.73 #DIV/0! 11 4 7.5 11 11 3.5
2004/05 8.40 6.00 2.73 1.04 -0.42 13 6 6 7 10 4
2005/06 11.50 13.00 2.87 -1.16 1.47 15 6 10.5 12.5 13 2.5
2006/07 12.18 14.00 2.69 -0.78 -0.38 16 7 10.5 13 14 3.5
2007/08 12.88 16.00 3.45 -0.92 -0.02 17 5 10.25 14 16 5.75
2008/09 12.62 16.00 3.75 -0.65 -0.95 17 5 10 14 16 6
2009/10 13.47 15.00 3.20 -1.24 0.84 17 3 12 15 16 4
2010/11 13.31 15.00 3.66 -1.09 0.08 17 4 11 15 16 5
2011/12 14.13 16.00 5.40 4.45 38.78 63 5 12 15 16 4
2012/13 14.43 15.00 4.28 4.47 50.87 62 4 14 15 16 2
2013/14 14.33 16.00 3.33 -0.14 8.80 39 3 14 15 16 2
2014/15 14.51 16.00 3.75 1.80 20.80 49 4 14 15 16 2
2015/16 14.03 16.00 3.12 0.32 19.89 54 3 13 15 16 3
2016/17 14.09 16.00 2.75 -1.21 3.23 33 3 13 15 16 3
2017/18 14.61 15.00 4.13 4.88 53.26 77 4 13 15 16 3
2018/19 14.22 15.00 3.29 3.87 63.36 69 3 13 15 16 3
2019/20 14.25 15.00 2.98 3.28 48.52 60 4 13 15 16 3
2020/21 14.36 15.00 2.75 2.60 41.72 56 3 13 15 16 3
2021/22 14.48 16.00 2.72 3.80 57.56 59 4 13 15 16 3
2022/23 14.73 16.00 3.88 6.68 80.08 68 3 13 15 16 3
AFAB 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
Standard Skewness Kurtosis Minimum Maximum Interquartile
Mean Mode deviation (per the (per the First Median Third range (IQR)
SKEW KURT quartile quartile
function function (Q1) (Q3)
in in
Excel) Excel)
2001/02
2002/03 7.00 #N/A 0.00 #DIV/0! #DIV/0! 7 7 7 7 7 0
2003/04
2004/05
2005/06 11.67 #N/A 1.25 -0.94 #DIV/0! 13 10 11 12 12.5 1.5
2006/07 14.00 14.00 0.00 #DIV/0! #DIV/0! 14 14 14 14 14 0
2007/08 13.64 16.00 3.52 -1.44 1.87 17 5 12 15 16 4
2008/09 13.31 16.00 3.10 -1.10 0.68 17 6 11 14 16 5
2009/10 14.84 15.00 1.73 -1.52 3.09 17 9 14 15 16 2
2010/11 13.86 16.00 3.25 -1.44 1.05 17 5 14 15 16 2
2011/12 14.93 16.00 5.37 6.25 58.12 63 5 14 15 16 2
2012/13 14.63 15.00 2.59 -1.05 3.48 25 6 14 15 16 2
2013/14 14.77 16.00 2.55 -0.15 8.26 30 4 14 15 16 2
2014/15 14.84 16.00 2.70 0.17 10.78 36 4 14 15 16 2
2015/16 14.37 16.00 2.43 -1.52 3.08 23 3 14 15 16 2
2016/17 14.31 15.00 2.38 -1.49 3.30 23 4 13 15 16 3
2017/18 14.59 15.00 2.98 3.73 48.41 57 5 14 15 16 2
2018/19 14.24 14.00 2.27 -0.67 4.35 26 4 13 14 16 3
2019/20 14.26 15.00 2.15 -0.48 5.43 30 4 13 15 16 3
2020/21 14.32 15.00 2.19 0.38 13.26 38 3 13 15 16 3
2021/22 14.43 15.00 2.35 2.97 41.16 47 4 13 15 16 3
2022/23 14.77 15.00 2.07 1.09 8.33 28 7 14 15 16 2
AMAB 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
Standard Skewness Kurtosis Minimum Maximum Interquartile
Mean Mode deviation (per the (per the First Median Third range (IQR)
SKEW KURT quartile quartile
function function (Q1) (Q3)
in in
Excel) Excel)
2001/02 5.00 #N/A 0.00 #DIV/0! #DIV/0! 5 5 5 5 5 0
2002/03 11.50 #N/A 0.50 #DIV/0! #DIV/0! 12 11 11.25 11.5 11.75 0.5
2003/04
2004/05 6.00 #N/A 0.00 #DIV/0! #DIV/0! 6 6 6 6 6 0
2005/06
2006/07 9.00 #N/A 2.00 #DIV/0! #DIV/0! 11 7 8 9 10 2
2007/08 10.20 9.00 2.48 1.88 3.77 15 8 9 9 10 1
2008/09 12.40 16.00 3.59 -0.71 -0.82 16 6 10.5 13 16 5.5
2009/10 12.62 15.00 3.54 -0.82 -0.17 17 3 10 14 15 5
2010/11 12.95 17.00 3.92 -0.91 -0.32 17 4 10.75 14.5 16 5.25
2011/12 13.22 16.00 5.49 2.77 18.78 49 5 10 15 16 6
2012/13 14.01 15.00 5.56 5.22 46.57 62 4 12 15 16 4
2013/14 13.84 16.00 3.94 0.34 8.27 39 3 13 15 16 3
2014/15 13.97 16.00 4.96 2.24 16.59 49 4 12 15 16 4
2015/16 13.38 16.00 4.07 1.37 19.86 54 3 11 15 16 5
2016/17 13.58 16.00 3.41 -0.71 2.04 33 3 12 15 16 4
2017/18 14.66 16.00 6.19 4.12 30.02 77 4 13 15 16 3
2018/19 14.06 16.00 4.74 3.17 31.93 69 3 13 15 16 3
2019/20 14.22 16.00 4.54 3.67 32.23 60 4 13 15 16 3
2020/21 14.46 16.00 3.69 3.34 38.05 56 3 13 15 16 3
2021/22 14.65 16.00 3.28 3.49 46.32 57 4 14 15 16 2
2022/23 15.12 15.00 5.02 4.53 34.03 55 5 14 15 16 2
Gender 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
Not Standard Skewness Kurtosis Minimum Maximum Interquartile
stated Mean Mode deviation (per the (per the First Median Third range (IQR)
SKEW KURT quartile quartile
function function (Q1) (Q3)
in in
Excel) Excel)
2001/02
2002/03 9.00 #N/A 0.00 #DIV/0! #DIV/0! 9 9 9 9 9 0
2003/04 8.67 11.00 3.30 -1.73 #DIV/0! 11 4 7.5 11 11 3.5
2004/05 9.00 #N/A 2.74 0.63 -1.70 13 6 6.75 8.5 10.75 4
2005/06 11.33 #N/A 3.86 -1.39 #DIV/0! 15 6 9.5 13 14 4.5
2006/07 12.33 13.00 2.62 -0.50 -0.40 16 8 10.75 13 13.75 3
2007/08 13.40 16.00 3.10 -2.13 5.41 16 5 13 14 15.75 2.75
2008/09 12.29 16.00 4.24 -0.43 -1.51 17 5 8 14 16 8
2009/10 11.50 #N/A 4.15 -0.29 -3.96 16 6 8.25 12 15.25 7
2010/11 11.00 #N/A 2.00 #DIV/0! #DIV/0! 13 9 10 11 12 2
2011/12 13.44 15.00 2.71 -1.63 2.69 16 7 13 14 15 2
2012/13 15.35 17.00 7.01 1.71 5.87 38 6 14 16 17 3
2013/14 11.67 17.00 5.85 -0.66 -1.78 17 3 4 15 17 13
2014/15
2015/16
2016/17 14.00 #N/A 0.00 #DIV/0! #DIV/0! 14 14 14 14 14 0
2017/18 14.00 #N/A 0.00 #DIV/0! #DIV/0! 14 14 14 14 14 0
2018/19 18.05 17.00 12.03 4.05 17.14 68 9 14 16 17 3
2019/20 14.31 15.00 2.37 -0.97 1.24 20 7 13 15 16 3
2020/21 14.38 15.00 2.59 0.53 6.59 27 6 13 15 16 3
2021/22 14.43 16.00 2.90 4.99 79.13 59 4 13 15 16 3
2022/23 14.43 16.00 4.82 7.17 75.78 68 3 13 14 16 3

Please note that information provided under FOIA relates to information
held by this Trust at the date on which the request was made.

We trust that you are satisfied with this response. If you are
dissatisfied then please write to us at [2][Tavistock and Portman NHS
Foundation Trust request email] within 40 working days, quoting the
reference details in the header of this email, and explaining the reason
for your dissatisfaction. The Trust would then appoint a senior manager,
not previously involved in this case, to conduct an internal review of our
original response and advise you of their findings, within 20 working
days, which would include either a revised response, or a rationale for
upholding the original response.

Yours sincerely,

Freedom of Information Team,

Tavistock and Portman
NHS Foundation Trust
Tavistock Centre
120 Belsize Lane
London NW3 5BA
[3]www.tavi-port.org
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From: Leo Pritchard
Sent: Tuesday, December 17, 2024 9:30 PM
To: Freedom of Information Requests
Subject: Freedom of Information request - GIDS patient ages over time

To whom it may concern,

I am writing to request, under the Freedom of Information Act 2000, that
you please provide the following information regarding the ages of
patients referred to the Gender Identity Development Service (GIDS):

For each financial year in which data are held, please provide the
following statistics on the ages of referred patients:
1. Mean
2. Mode
3. Standard deviation
4. Skewness (per the SKEW function in Excel)
5. Kurtosis (per the KURT function in Excel)
6. Minimum
7. Maximum
8. First quartile (Q1)
9. Median
10. Third quartile (Q3)
11. Interquartile range (IQR)

Please provide these data for each individual GIDS clinic separately and
for the service as a whole (GIDS-wide). Please provide these data
separately for patients assigned male at birth and those assigned female
at birth, and in combination regardless of sex assigned at birth, at both
the GIDS-wide and individual clinic level.

Please provide these data in a spreadsheet file to make it easier to
analyse them. Thank you very much for your time and help.

Yours sincerely,
Leo Pritchard

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