The triennial assessment shows results broadly flat since the last round, ending a period of small declines reported in several countries.
Reading scores among 15-year-olds across the Nordic region held broadly steady in the latest triennial assessment.
Differences between countries narrowed slightly. The next round is due in three years.
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The decision was widely expected. The bank said inflation across the euro area is now close to its two-percent target and signalled no change before the autumn.
The disclosure is unusually specific for the industry. Independent analysts say the per-task numbers are useful but hard to compare across vendors.
Researchers combining satellite and buoy records report the circulation has weakened by about four percent since the 1980s. They caution that the trend is small relative to natural year-to-year swings.
More than 14,000 runners completed the course on Sunday. Organisers said the mild conditions helped a large share finish under four hours.