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Table 1 Indicators for SODIS-use

From: Factors associated with compliance among users of solar water disinfection in rural Bolivia

Indicator Rational and Interpretation
SODIS-use indicators
1. "Bottles sun-exposed"
Proportion of weeks during which SODIS bottles were observed to be exposed to sunlight (as observed by community-based staff)
Indicator for the intention to disinfect water using SODIS. Indirect indicator to measure actual use.
2. "Bottles ready-to-drink"
Proportion of weeks during which SODIS bottles were ready-to-drink (as observed by community-based staff)
Households regularly disinfecting water with SODIS usually have bottles of SODIS-treated water ready-to-drink available in-house. Considered to be a more reliable indicator for actual use than "bottles exposed to sunlight"
3. "Classified user"
Proportion of weeks during which a family was classified as SODIS-user (judgement of community-based staff after observing the family for at least 4 weeks).
Considered the most reliable indicator for actual use. Staff living in the community bases their judgement on daily observations of correct application, placing bottles in plain sunlight and/or getting drinking water from a SODIS-bottle when asked for.
4. "Behavioural change"
Regression coefficient of a logistic regression of the occurrence of bottles exposed to the sunlight (yes/no in a given week) versus time.
Indicates behavioural change over time. Coefficient reflects an increase (high values), decrease (low values) or constancy of exposing bottles to sun throughout monitoring time. Note: a coefficient of B = 0 indicates constant SODIS-use at high or low levels
Monitoring indicators
5. "Time in Study - Bottles sun-exposed"
Total number of weeks during which "Bottles exposed to sunlight" was recorded
Discriminates and identifies households with few weeks observed.
6. "Time in Study - Classified user"
Total number of weeks during which "Classified user" was recorded
Discriminates and identifies households with few weeks observed to classify as SODIS-user.