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Table 6 Number of villages with optimal, moderate, alarm and emergency house index (H.I.)

From: Analyzing the spatio-temporal relationship between dengue vector larval density and land-use using factor analysis and spatial ring mapping

District no.

Sample villages

Optimal index

Moderate index

Alarm index

Emergency index

6501

20

1

0

5

14

6502

9

1

1

1

6

6503

8

0

0

1

7

6504

12

0

0

4

8

6505

7

0

0

1

6

6506

13

1

1

2

9

6507

6

0

0

1

5

6508

11

0

0

1

10

6509

6

0

1

2

3

  1. According to the risk levels set by National Institute of Health (NIH), Thailand optimal control is a H.I. < 1% and emergency levels of infestation are indicated by a H.I. of 10% or greater. Further as per Ministry of Public Health Thailand (MOPH), Phitsanulok two more groups were categorized, i.e. H.I. between 1% and 5% as moderate index and H.I. between 5 to 10% as alarm index.