 The other two major international competition for track and field are organised by the IAAF . The IAAF had selected the Olympic competition as its world championship event in 1913 , but a separate world championships for athletics alone was first held in 1983 – the IAAF World Championships in Athletics . The championships comprised track and field competitions plus the marathon and racewalking competitions . Initially , this worked on a quadrennial basis but , after 1991 , it changed to a biennial format . In terms of indoor track and field , the IAAF World Indoor Championships in Athletics has been held every two years since 1985 and this is the only world championships that consists of solely track and field events . 
 The other two major international competition for track and field are organised by the IAAF . The IAAF <a href='been_done' title='1'><mark>had</mark></a> selected the Olympic competition as its world championship event in 1913 , but a separate world championships for athletics alone was first held in 1983 – the IAAF World Championships in Athletics . The championships comprised track and field competitions plus the marathon and racewalking competitions . Initially , this worked on a quadrennial basis but , after 1991 , it changed to a biennial format . In terms of indoor track and field , the IAAF World Indoor Championships in Athletics <a href='been_done' title='2'><mark>has</mark></a> been held every two years since 1985 and this <a href='drop_aux' title='3'><mark>is</mark></a>the only world championships <a href='null_relcl' title='4'><mark>that</mark></a><a href='uninflect' title='5'><mark>consists</mark></a> of solely track and field events . 
The other two major international competition for track and field r organised by the IAAF . da IAAF done selected the Olympic competition as its world championship event in 1913 , but a separate world championships for athletics alone was first held in 1983 – the IAAF World Championships in Athletics . The championships comprised track and field competitions plus tdamarathon and racewalking competitions . Initially , this worked on a quadrennial basis but , after 1991 , it changed to a biennial format . In terms of indoor track and field , thdaAAF World Indoor Championships in Athletics done been held every two years since 1985 and this thedaly world championships consist of solely track and field events .