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Content Preface Review of literature Analysis of 207 cases Own study General discussion Summary References Case reports Appendix
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| Jan Wålinder TRANSSEXUALISM A STUDY OF FORTY-THREE CASES |
| Own Study |  |
Parental age and birth order
If a disease is caused mainly by genetic factors the victims should not differ from healthy persons in parental age at birth or in birth order. Information regarding paternal age, maternal age and birth order was forthcoming in 38, 39 and 39 of the present cases, respectively. It was lacking for 4 patients born outside Sweden, and the paternal age was not known in I of the other cases. The parental ages were compared with the ages of all Swedish mothers and fathers getting children the same years the patients were born. The figures were as follows:
| Maternal age | Transsexuals | Controls |
| -20 | 3 2. | 1 |
| 20-25 | 9 | 9.2 |
| 25-30 | 12 | 11.1 |
| 30-35 | 7 | 8.8 |
| 35-40 | 7 | 5.5 |
| 40-45 | 1 | 2.1 |
| 45- | - | 0.2 |
The mean maternal age was 28.8 years in the present series against 29.3 years in the control series. The difference is not significant.
| Paternal age | Transsexuals | Controls |
| -25 | 6 | 3.3 |
| 25-30 | 8 | 9.4 |
| 30-35 | 10 | 10.4 |
| 35-40 | 7 | 7.7 |
| 40-45 | 5 | 4.4 |
| 45- | 2 | 2.8 |
The mean paternal age was 33.0 in the present series, against 33.8 years in the control
series. The difference is not significant.
The figures for birth rank were as follows:
| Number of affected patients by rank | |||||||||||||
| Size of sibship |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Expected no. each ran |
| 1 | (5) | ||||||||||||
| 2 | 6 | 5 | 5.50 | ||||||||||
| 3 | 4 | 2 | - | 2.00 | |||||||||
| 4 | 1 | - | - | 3 | 1.00 | ||||||||
| 5 | 1 | - | - | - | 3 | 0.80 | |||||||
| 6 | - | - | - | 2 | - | - | 0.33 | ||||||
| 7 | - | - | 1 | - | - | - | - | 0.14 | |||||
| 8 | - | - | - | - | - | - | - | 1 | 0.13 | ||||
| 9 | - | - | - | - | - | 1 | 1 | - | - | 0.22 | |||
| 10 | 1 | - | - | - | - | - | - | - | - | 1 | 0.20 | ||
| 11 | - | - | - | - | 1 | - | - | - | - | - | - | 0.09 | |
| 12 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Observed total |
13 | 7 | 1 | 5 | 4 | 1 | 1 | 1 | - | 1 | - | - | 34.0 |
| Expected total |
10.41 | 10.41 | 4.91 | 2.91 | 1.91 | 1.11 | 0.78 | 0.64 | 0.51 | 0.29 | 0.09 | - | 34.0 |
As seen from the table, the 39 patients were randomly distributed by birth rank. The difference between the observed and expected figures was not significant.
Thirteen patients were first-born and 13 last-born. These figures do not differ significantly from the number which could be expected - 10.4.
Thus neither the maternal age, nor the paternal age differed significantly from that in an average Swedish population. Nor did the patients differ significantly from the expected in birth order
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