Table 7.

Identification of NMOSD patients for drug trials: risk of relapse at 1 and 2 years based on numbers of attacks in preceding 2 years

No. of attacks in the past 2 years	Disease duration	% of patients that relapse in 1 year	% of patients that relapse in 2 years	Average % patients fulfilling criteria over timea
At least 3	Any	46.60%	67.90%	6.6%
	<5 years	52.00%	73.30%	2.7%
	≥5 years	44.90%	66.30%	3.9%
At least 2	Any	42.60%	63.70%	17.6%
	<5 years	46.90%	68.00%	5.0%
	≥5 years	40.20%	62.30%	12.6%
At least 1	Any	38.70%	59.20%	40.7%
	<5 years	41.10%	62.50%	7.7%
	≥5 years	36.6%	58.20%	33.0%
Any	Any	34.50%	54.20%	100%
	<5 years	37.90%	57.50%	14.8%
	≥5 years	33.40%	53.10%	85.2%

^aOn 1 January 2013.