Proportions and statistics (op de / van de)

Expressing Ratios: "Op de" and "Van de"

To express a ratio like "one in four" or "three in ten", use op de followed by a plural noun.

One in four adults struggles with insomnia.
Eén op de vier volwassenen kampt met slapeloosheid.

Alternatively, to express "out of" (like "two out of five"), use van de. The two structures are interchangeable and frequently used in formal reporting and everyday statistics.

According to the statistics, two out of five people struggle with stress.
Volgens de statistieken kampen twee van de vijf mensen met stress.

Subject-Verb Agreement with Statistics

When a proportion acts as the subject of a sentence, the verb agrees with the first number in the ratio.

If the proportion begins with a number greater than one (like twee, drie, or acht), use a plural verb.

Three in ten employees report a severe sleep deprivation.
Drie op de tien medewerkers rapporteren een ernstig slaaptekort.
The statistics show that eight out of ten adults experience fatigue.
Uit de statistieken blijkt dat acht op de tien volwassenen vermoeidheid ervaren.

If the proportion begins with één (one), the verb must be singular, even though the phrase as a whole refers to a larger plural group.

It is determined that one in ten people uses sleeping pills.
Er wordt vastgesteld dat één op de tien mensen slaappillen gebruikt.

Notice how ervaren is plural to match acht, while gebruikt is singular to match één.

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