Table 1 Description of the flower farms and workers participated in the study

Farm size (hectares)

51

12

5

41

Number of greenhouses

21

7

3

5

Number of pack-houses

2

1

1

2

Number of workers

1,300

700

350

1295

Sample Size

     Interview

67

47

41

93

     FeNO measurement

67

47

NA

NA

     Endotoxin measurement

25

21

NA

NA

Pest control methods

CP, BA

CP

CP

CP

Pesticide spraying time

6:00–10:00 AM

6:00–10:00 AM

6:00–10:00 AM

3:00–6:00 PM

Flower cultivated

Roses

Roses

Roses

Roses