In Denmark we have got no official correct account of the number of immigrantes living in the country. Now the authorities try to make a better basic for their prognoses of the population by estimating the demografic parameter of fertility among foreign women immigrated to Denmark. Fertility is the average number of children expected born by each women in the ages of fertility. China and Mexico are among the few countries in the world, where UN observed an adjustment of the rate of fertility, even in the native population. The population policies in the mentioned countries had to be very restrictive to get these decreases. In Denmark the assertion by E. Vesselbo about an adjustment of the rate of fertility is aimed at the islamic immigrantes (about 75% of the group of most foreign immigrantes in Denmark for the last 17 years), and the Danish population policy is certainly the opposite of restictive.

Primo November 2000 SFI (Institute of Social Investigations) published a report that assumed the idea that fertility of the foreigners adjust to the fertility of Danish women from the second generation of immigrants. Therefore we assume, they have made an analyses based on a sample of 700 (mentioned both in the media and in the abstract on the Net) covering "time-iod of stay in Denmark" and "total number of born children". We have not read the report, but we certainly have a few relevant questions inspired by the reports in the Press and the abstract: Was the sample of 700 made random, and how was the parameters secured estimated unbiased? How was the selection of information managed - by letter included rates of reply (we read in the abstract by interviews) or with help from local authorities controling by use of the Central Personal Number (no confidential information anymore according to a letter (ref. no. LR/mbj and journal. no 1.3.9-018) of July 7th/2000 On Notification to the Supervision of Data of Private Files mailed from the organization Pension and Assurance in the House of Pension, Copenhagen, and according to Law no 426 on The Central File of Persons, May 31th 2000. We have links to both sources in Danish:

Earlier (in the late 1980s) the authorities refused to use the Central Personal Number referring to the confidentiality of exactly this number.
Taken this possible new fact coming from a NGO-organization into consideration it is not quite easy to understand why the authorities do not measure the fertility of immigrants directly by use of the Central Personal Number. This would certainly ensure the quality of such an investigation.
Is this to be understood in the sense that the Central Personal Number is still confidential (and even confidential to the authorities, the public only need to know the final result), when it has been assigned to an immigrant.
As a new investigation how did it register the information?
Was the information in any way controled to be the truth?
Were the immigrants asked about their wishes of having a specific number of children, or were they asked after having born all their children, now included in the third generation?
Was the way most Pakistanians and Turks marry by finding their bride in the homeland included or excluded from the analyses? Especially relevant as the abstract tells that the respondants were mostly descend from these nationalities.
Which test was used (no test was used, according to the Danish abstract), and how was it used to make the conclusion that the immigrantes do not have more children than the Danish women, provided they are included in the second generation of immigrants in Denmark?