(1) Any employment in which a worker who has contracted a disease was engaged at any time before symptoms of the disease first became apparent is, unless the contrary is established, taken for this Act to have been a substantial contributing factor to the worker's contracting the disease if the incidence of the disease among people who have engaged in that kind of employment is significantly greater than the incidence of the disease among people who have engaged in employment generally in the place where the worker was ordinarily employed.
(2) Any employment in which a worker who has suffered an aggravation, acceleration or recurrence of a disease was engaged at any time before symptoms of the aggravation, acceleration or recurrence first became apparent is, unless the contrary is established, taken for this Act to have been a substantial contributing factor to the aggravation, acceleration or recurrence if the incidence of the aggravation, acceleration or recurrence of the disease among people suffering from the disease who have engaged in that kind of employment is significantly greater than the incidence of the aggravation, acceleration or recurrence of the disease among people suffering from the disease who have engaged in employment generally in the place where the worker was ordinarily employed.
(3) The death of a worker is taken for this Act to have been substantially contributed to by a disease if, apart from that disease, the death of the worker would have happened at a significantly later time.
(4) An incapacity for work or facial disfigurement of a worker is taken for this Act to have been substantially contributed to by a disease if, apart from the disease—
(a) the incapacity or disfigurement would not have happened; or
(b) the incapacity would have begun, or the disfigurement would have happened, at a significantly later time; or
(c) the extent of the incapacity or disfigurement would have been significantly less.
(5) This section does not limit the operation of
section 27.