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KCE Reports 77 Orthodontics 159
7.9.3.6 Interval duration between prestation 305631 and 305675
Table 61 shows the mean and median number of days lapsed between 305631 and
305675 acts (2nd part of orthodontic appliance, can be prescribed only after at least 6
treatment months of active treatment (6 times 305616)), with the standard deviation (st
d), the IQR as well as the minimum and maximum range.
Table 61: Number of days lapsed between 305631 and 305675 acts (2nd part
of orthodontic appliance, can be prescribed only after at least 6 treatment
months of active treatment (6 times 305616))
mean int median int std int q1 int q3 int min int max int
305675 305675 305675 305675 305675 305675 305675
291,9 219,5 218,3 183 301 56 1699
Source: Common Sickness Funds Agency (IMA/AIM), February 2008
The median interval duration until the "second part of appliance" (prestation of 305675,
which can be attested after 6 treatment months, i.e. around after 180 days) is 219.5
days, which is after +- 7 real months; the IQR range is from 183 to 301 days.
Concerning the minimum interval, a mistake must have occurred as it is not legal to
perform the 305675 act, before an interval of at least 180 days. For the maximum
interval of 1699 days, a plausible explanation could be that the treatment is interrupted
by the practitioner and restarted at a later stage. As this implies an interruption of 56. 6
months (or 4.7 years), this is a rather long period for an interruption of the treatment.
• The median interval duration between prestation 305631 and 305675,
which can be attested after 6 treatment months, is 219.5 days
(approximately 7 months).
• The median "treatment month" has a duration of 36.6 days
• A treatment interval has an interquartile range from 183 to 301 days.
• As the 305675 act can legally only be performed after an interval of at
least 180 days, a minimum interval of 56 days is not possible.
• For the maximum interval of 1699 days, a plausible explanation could be
that the treatment is interrupted by the practitioner and restarted at a
later stage. An interruption of 56.6 months (or 4.7 years), is however
extreme.
7.9.4 CM/MC data
For the assessment of treatment duration, data were also provided from a third source,
namely the Christelijke Mutualiteit / Mutualité Chrétienne (CM/MC).
Table 62 shows the General orthodontic consumption of prestation 305631 (start of
orthodontic treatment) and monthly activation visits (305616 RIZIV/INAMI-acts) by a
sample of 3 to 18 year olds who started their orthodontic treatment in the year 2000
(representative sample from 4.3 million CM/MC-members)