Predicting Asthma Outcome Using Partial Least Square Regression and Artificial Neural Networks

Table 2

Encoding of prognostic factors.

Prognostic factor	Coding
Sex	0 (Male)	1 (Female)
Residence	0 (Urban)	1 (Semiurban)	2 (Rural)
Season of the symptoms	0 (None)	1 (Winter)	2 (Autumn)	3 (Spring)	4 (Summer)	5 (>2 Seasons)
Type of heating	0 (Central heating)	1 (Wood stove)	2 (Oil Stove)	3 (Fireplace)	4 (Central heating + Fireplace)
Pregnancy duration in weeks	0 (<37)	1 (37-38)	2 (>38)
Allergens	0 (0)	1 (3.5–6 mm)	2 (>6 mm)