Table 1.

Demographic and baseline characteristics of 171 women who applied to the internet course.

	Total N = 171; 100%	Treatment completed N = 100 (58.5%)	Treatment not completed N = 71 (42.5%)	p
Demographic characteristics
% Women	100%	100%	100%	NA
Age mean (SD)	49.4 (8.7)	50.1 (9.0)	48.3 (8.0)	0.17
% Born in the Netherlandsa	84.2%	85.0%	83.1%	0.74
% Higher education	53.2%	59.0%	45.1%	0.07
% Living together	78.9%	79.0%	78.9%	0.98
% In a paid job	78.9%	80.0%	77.5%	0.69
% On sick leave	47.4%	38.8%	60.0%	0.02
Type of treatment
% Complete breast amputation	60.8%	64.0%	56.3%	0.31
Years between operation and admission to intervention, mean (SD)	2.3 (2.1)	2.4 (2.2)	2.2 (2.0)	0.62
% Radiotherapy	65.5%	66.0%	64.8%	0.87
% Chemotherapy	77.8%	77.0%	78.9%	0.77
% Hormonal therapy	76.0%	76.0%	76.1%	0.99
% With lymphe oedemia	46.8%	41.0%	54.9%	0.07
Sleep characteristics
Insomnia severity index, mean (SD)	16.5 (3.6)	16.1 (3.4)	17.0 (3.9)	0.11
Fatigue Severity Scale, mean (SD)	39.3 (11.1)	37.3 (11.1)	42.2 (10.6)	< 0.01
% With sleep medication	45.0%	48.0%	40.8%	0.35
% Insomnia before breast cancer	38.0%	41.0%	33.8%	0.34
% Sleep medication in history	25.7%	29.0%	21.1%	0.25
% Other sleep treatment in history	7.6%	8.0%	7.0%	0.82
Psychological symptoms and functioning
HADS-anxiety	7.6 (3.7)	7.6 (3.7)	7.6 (3.8)	0.95
HADS-depression	5.5 (3.7)	5.2 (3.5)	5.9 (4.0)	0.20
WSAS functioning (total)	16.2 (9.7)	15.4 (9.6)	17.3 (9.7)	0.20
WSAS household	3.9 (2.8)	3.5 (2.6)	4.5 (2.9)	0.12
WSAS work	4.5 (3.1)	4.4 (3.1)	4.6 (3.2)	0.63
WSAS friendship	3.8 (2.8)	3.7 (2.7)	4.0 (2.8)	0.46
WSAS social functioning	4.0 (2.7)	3.9 (2.7)	4.2 (2.8)	0.48
% Medical referral	33.5%	33.0%	34.5%	0.86

^aParticipant + both parents were born in the Netherlands.