Correlational finding on Happiness and subject: Phase of sexe reassignment

StudyLindqvist et al. (2017): study SE 2003
TitleQuality of life improves early after gender reassignment surgery in transgender women
SourceEuropean Journal of Plastic Surgery, 2017, 40, 223-226
DOIDOI:10.1007/s00238-016-1252-0
PublicTransgender women undergoing gender reassingment surgery, 2003-2015, Sweden
SampleNon-probability purposive sample
Non-Response
Respondents N =190

Correlate
Author's labelTime after sex reassignment surgery
Page in Source Data provided on request
Our classificationPhase of sexe reassignment
Operationalization
T0 Before sex reassingment surgery 
T1 1 year after sex reassingment surgery
T3 3 years after sex reassingment surgery
T5 5 years after sex reassingment surgery
Observed distributionT0: N = 164, T1: N = 107, T3: N = 63, T5: N = 43

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
M-TH-cm-sq-v-6-aDM=+/-
     M      SD    Difference with T0     
T0   3.79   1.49   -              
T1   3.98   1.44   +0.19         
T3   3.79   1.45   +0.01          
T5   3.74   1.38   -0.04
M-TH-cm-sq-v-6-aDMt=+
                 Mt    SDt   Difference with T0
T0 (before)      5,57  2,98  -
T1               5,96  2,88  +0,39
T3               5,59  2,90  +0,01
T5               5,49  2,76  -0,09
After (T1,T3,T5) 5,76  2,86  +0,09 
averaged

Computed by WDH tean using linear stretch of 
weighted averages
M-TH-cm-sq-v-6-aD%sr=+/-
T1-T0  T3-T0  T5-T0
+5,1%  +0,2%  -1,1%
M-TH-cm-sq-v-6-ad=+/-
+0.13  +0.0   -0.03


Appendix 1: Happiness measures used
CodeFull Text
M-TH-cm-sq-v-6-aSelfreport on single question:

During the past 4 weeks….. Have you been a happy person?
6 all of the time
5 most of the time
4 a good bit of the time
3 some of the time
2 a little of the time
1 none of the time

Item MH5 in SF-36 (Medical Outcome Study 36 item Short Form)


Appendix 2: Statistics used
SymbolExplanation
dCohen's COEFFICIENT FOR GROUP DIFFERENCES. Also called EFFECT SIZE
Type: descriptive statistic only
Measurement level: Correlate : dichotomous, Happiness level: metric
Theoretical range: unlimited.

Meaning: effect size indicator for difference of means.
Formula: Cohen's d = (M2 - M1) ? SDpooled
SDpooled = ?((SD1^2 + SD2^2) ? 2)
D%srDIFFERENCE in % of SCALE RANGE
Scale range = highest theoretical value minus lowest theoretical value
DMDIFFERENCE of MEANS
Type: descriptive statistic only.
Measurement level: Correlate: dichotomous, Happiness: metric
Range: depending on the happiness rating scale of the author; range symmetric about zero.

Meaning: the difference of the mean happiness, as measured on the author's rating scale, between the two correlate levels.
DMtDIFFERENCE of MEANS AFTER TRANSFORMATION
Type: descriptive statistic only.
Measurement level: Correlate: dichotomous, Happiness: metric
Theoretical range: [-10; +10]

Meaning: the difference of the mean happiness (happiness measured at a 0-10 rating scale) between the two correlate levels.
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl