Methods

The SEARCH II index is based on ratings attributed to the participating children’s perceptions of thermal comfort, indoor air quality, noise and lighting in the classroom, using questions from the SEARCH II comfort questionnaire (see link below).


Additional information








Initially, two methods (versions 1 and 2) were used to combine the answers to the four questions. Version 1 (CCI-1) was based on the assumption that temperature, air quality, noise and lighting were equally important in children’s perception of comfort. In Version 2 (CCI-2), the various comfort factors were not taken into consideration equally but were weighted on the basis of expert opinion (air quality 40 percent; temperature 30 percent; noise 20 percent; and lighting 10 percent). In order to ensure a uniform scoring system for the answers to all four questions, the scores shown in Table 10 were used in both versions.

TABLE 10 Scoring for comfort factors in CCI-1 and CCI-2

Scores

Air quality

Temperature

Noise

Lighting

5 (very good)

very good (3)

very good (0)

very quiet (3)

adequate (0)

4 (good)

(quite) good (1 or 2)

quite cool or warm (-1 or +1)

(quite) quiet (1 or 2)

quite dim or light (-1 or 1)

3 (neutral)

neutral (0)

-

neutral (0)

-

2 (bad)

(quite) bad (-1 or -2)

cool or warm (-2 or 2)

(quite) loud (-1 or -2)

dim or light (-2 or 2)

1 (very bad)

very bad (-3)

cold or very warm (-3 or 3)

very loud (-3)

very dim or light (-3 or 3)

Version 1 was created using:

0.25* air quality scores + 0.25* temperature scores + 0.25* noise scores + 0.25* lighting scores.

Version 2 was created using:

0.4* air quality scores + 0.3* temperature scores + 0.2* noise scores + 0.1*l ighting scores

At the SEARCH II comfort experts’ meeting, held in Szentendre, Hungary, on October 15, 2012, it was suggested that the combined comfort index should give greater weight to negative (disturbing) perceptions. Two further versions (CCI-3 and CCI-4) were therefore created. Version 3 was based on the assumption that if a child’s perception was “very bad” in the case of one or more of the four factors, this should influence the index more than the other responses. (If a child’s perception of air temperature, for example, was "very warm", and their perception of air quality, noise and lighting was "good", the air temperature question was to be given greater weight.) The order of the scores had to be inverted in order to leave more room to express perceptions of discomfort.

In order to ensure a uniform scoring system for answers to all four questions, the scores in Table 11 were used. Score 4 is omitted because of the weighting given to extreme values.

TABLE 11 Scoring for comfort factors in CCI-3 and CCI-4

Scores

Question B1

Air quality

Temperature

Noise

Lighting

1 (very good)

very good (3)

very good (3)

very good (0)

very quiet (3)

adequate (0)

2 (good)

(quite) good
(1 or 2)

(quite) good
(1 or 2)

quite cool or warm
(-1 or +1)

(quite) quiet
(1 or 2)

quite dim or light
(-1 or 1)

3 (neutral)

neutral (0)

neutral (0)

-

neutral (0)

-

5 (bad)

(quite) bad
(-1 or -2)

(quite) bad
(-1 or -2)

cool or warm
(-2 or 2)

(quite) loud

(-1 or -2)

dim or light
(-2 or 2)

6 (very bad)

very bad (-3)

very bad (-3)

cold or very warm
(-3 or 3)

very loud (-3)

very dim or light
(-3 or 3)

Version 3 was created using:

0.25* air quality scores + 0.25* temperature scores + 0.25* noise scores + 0.25* lighting scores.

Version 4 was created using:

0.4* air quality scores + 0.3* temperature scores + 0.2* noise scores + 0.1* lighting scores

 
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