Some selection conversations treat prior championship experience - at area level (African, Asian, European, NACAC, Oceania or South American Championships), or at Olympic/World level itself - as a step on the way to a global medal. Is that actually what happens, or is a medal more often won without much of a run-up at all?
This page counts, for every athlete who won an Olympic or World medal since 2015, how many senior championships of any kind - area, Olympic or World - they had already competed in before that first medal, broken down by event and gender. An athlete who reached three previous Olympic or World finals without medalling, then finally broke through, counts that experience here, not just prior area-level appearances.
This page compares every event, so the differences between them are the point. 19 events, men and women.
A related question: turning up to an earlier senior championship is not the same as getting far enough to matter there. This page also looks at every medallist's first-ever senior championship - area, Olympic or World, whichever event it happened to be in - and checks whether they reached the final at it, or went out in the heats/qualifying round.
Field-event medallists had more senior championship experience on the way to their first global medal than track medallists. Field-event medallists had 4.5 senior championships (area, Olympic or World) on average before their first Olympic/World medal since 2015-01-01, against 3.2 for track medallists.
Javelin medallists arrive at their first medal with the most senior championship experience of any event. Men's Javelin medallists had competed in 6.0 senior championships (area, Olympic or World) on average before their first Olympic or World medal, and women's Javelin medallists 6.3 - the highest of all 19 events, in both.
The 400mH, 400m and 100m carry the least experience. Medallists in these events typically arrive with the fewest senior championships of any event on their record - around 2.4 to 3.0 on average.
In Javelin, that experience mostly comes before the medal, not after. Every count on this page is restricted to championships raced before the athlete's first global medal, so this high average is consistent with prior championships acting as a genuine step on the way up in this event, rather than a consolation entered afterwards.
Restricting the count to the same event barely changes Javelin's figure (men: 6.0 any event vs 6.0 same event; women: 6.3 vs 6.3). So the pattern isn't driven by athletes picking up unrelated titles in other events along the way.
A decent share of medallists did not reach the final the first time they showed up at a senior championship at all. Across all events and both genders, 40% of the 530 medallists in this dataset went out in the heats or a qualifying round the first time they competed at a senior championship, whichever event that was in.
Women medallists were more likely than men to miss the final on that first appearance. 43% of women did not reach the final at their first senior championship, against 37% of men - a gap that held up in both track (38% men vs 41% women) and field events (36% men vs 45% women), rather than being driven by one or two events.
800m (men) / 400m (women) medallists found it hardest of all to reach a final on debut. 800m medallists missed the final at their first senior championship 60.0% of the time (men), and 400m medallists 77.8% of the time (women) - excluding 10,000m, 5000m, 3000m SC and Combined from this ranking, since those events are structurally close to a guaranteed final regardless of the athlete (see the caveats above the chart).
This isn't the same ranking as the "most experienced on debut" figures above - an event can demand a lot of prior championships before a medal (like javelin or hammer) while still being comparatively easy to reach a final in in any one of them, and vice versa. The two charts are measuring different things: how long the run-up typically is, and how hard the very first step of it is.
Scope of data used in this analysis: