Question: Which of the combined events are most common?
About the article "Track and field", section "Combined events".

Candidate passages:
Combined events are competitions in which athletes participate in a number of track and field events, earning points for their performance in each event, which adds to a total points score.
Outdoors, the most common combined events are the men's decathlon and the women's heptathlon.
Due to stadium limitations, indoor combined events competition have a reduced number of events, resulting in the men's heptathlon and the women's pentathlon.
Athletes are allocated points based on an international-standard points scoring system, such as the decathlon scoring table.  
Combined (or multi-discipline) events are competitions in which athletes participate in a number of track and field events, earning points for their performance in each event, which adds to a total points score.
Outdoors, the most common combined events are the men's decathlon and the women's heptathlon.
Due to stadium limitations, indoor combined events competition have a reduced number of events, resulting in the men's heptathlon and the women's pentathlon.
Athletes are allocated points based on an international-standard points scoring system, such as the decathlon scoring table.
The Ancient Olympic pentathlon (comprising long jump, javelin, discus, the "stadion" race and wrestling) was a precursor to the track and field combined events and this ancient event was restored at the 1906 Summer Olympics (Intercalated Games).
A men's decathlon was held at the 1904 Summer Olympics, albeit contested between five American and two British athletes.
Track and field is a sport which combines various athletic contests based on the skills of running, jumping, and throwing.
The name is derived from the sport's typical venue: a stadium with an oval running track enclosing a grass field where the throwing and jumping events take place.
The running events, which include sprints, middle and long-distance events, and hurdling, are won by the athlete with the fastest time.
The jumping and throwing events are won by the athlete who achieves the greatest distance or height.
Regular jumping events include long jump, triple jump, high jump and pole vault, while the most common throwing events are shot put, javelin, discus and hammer.
There are also "combined events", such as heptathlon and decathlon, in which athletes compete in a number of the above events.
Most track and field events are individual sports with a single victor, but a number are relay races.
Events are almost exclusively divided by gender, although both the men's and women's competitions are usually held at the same venue.
Track and field is often categorised under the umbrella sport of athletics, which also includes road running, cross country running, and race walking.
At the international level, the two most prestigious international track and field competitions are athletics competition at the Olympic Games and the IAAF World Championships in Athletics, while the International Association of Athletics Federations is the international governing body.
Records are kept of the best performances in specific events, at world and national levels, right down to a personal level.
However, if athletes are deemed to have violated the event's rules or regulations, they are disqualified from the competition and their marks are erased.
In North America, the term track and field may be used to refer to athletics in general, rather than specifically track and field events. 
An octathlon in athletics is an event which consists of eight track and field events.
The word "octathlon" derives from the Greek words okto, the number 8, and athlos, meaning contest.
The most common version of the combined event is contested by boys at youth level, most notably at the IAAF World Youth Championships in Athletics.
The events within the youth octathlon are: the 100 metres, long jump, 110 metres hurdles, high jump, 400 metres, shot put, javelin throw, and finally the 1000 metres.
Although this is primarily a youth or junior event, logistical problems have seen senior octathlons contested, for example at the 2007 South Pacific Games. 
The most common adverse events at the beginning of treatment are nausea and headache.
More serious adverse events are peripheral neuropathy, which can occur in up to 33% of patients with advanced disease, oral ulcers, oesophageal ulcers and, rarely, pancreatitis.