Mezue ahịrịokwu na-esonụ: Nerhagen bidoro na World Championship-larịị na World Championship na Antholz-Anterselva na 1983. O sonyekwara n'asọmpi Iko Mbaụwa n'afọ
1985, 1986 na 1987 maka Norway. Onye kachasị mma ya na World Championships bịara na 1985 na Ruhpolding ebe Nerhagen kwụsịrị 15th na 20 km onye. Ọkacha mma ya na-emecha na World Championships bụ ọla nchara nke bịara na nke mbụ ya na 1983, nke ga-abụkwa naanị ihe nrite ya na World Championships.