("i løbet af det foregående år") er specielt lav blandt arbejdere i varige eftermiddags- eller natskift (10 procent, sammenlignet med 20 procent for hele den arbejdende befolkning).
With regard to actual participation, material from the recent Danish survey (Danish ile 1 f a r e Sur ν e y, 1976) indicates that participation in oc­cupational courses ("during the past ¿rear") is particularly low among permanent afternoon and night shift workers (lo per cent, compared with 2o per cent among the total working population).