Table 2.

Daily revision time (hours/day) and stress level

	Mean	SEM
(A) Revision time
Diary (h/day)	2.93	0.25
Questionnaire (h/day)	3.85	0.28

	N	% of total N
Questionnaire
< 3 h/day	14	35.90
3–5 h/day	16	41.03
5–7 h/day	7	17.95
> 7 h/day	2	5.13

	N	% of total N
(B) STRESS (Questionnaire)
Low	8	20.51
Moderate	18	46.15
High	13	33.33

A The daily revision time as given by the pre-structured diary and the questionnaire were significantly different (Wilcoxon; p < 0.001); however, both data sets were correlated (Kendall’s tau = 0.55; p < 0.001) indicating a systematic variation. B Subjects assessed their subjectively perceived level of stress as being low, moderate of high in the questionnaire. The number of subjects and the percentage of total population are given