the 1% significance level for both treatments 2 and 6 in Models 5 and 6, which include district fixed effects. Consistent with previous methods, treatment 3, payment of ETB 25 and no network, has a negative impact on stove use frequency compared to treatment 5. These results therefore also contradict the hypothesis that paying for the Mirt stove promotes use.

Treatments 2, 3 and 6 are insignificant without the district fixed effects. These pooled OLS results therefore suggest that once unobserved locational differences are taken into account, treatments that include the network aspect may be important for the use of Mirt stoves, though the insignificant effect of treatment 4 makes this conclusion less clear. Consistent with results in table 3, we find that households on average increased their use frequency over time. Compared with round 1, which is the base category, we find that stove use frequency is greater in the second, third and fourth rounds than in round 1. Consistent with our other results, we also find the largest effect in round 3, which was measured during the March to May 2014 period.

<u>Table 9 Regression results from pooled OLS. Dependent variable is number of times per week Mirt stove is used</u>

|`Variables Model 1 Model_2 Model_3 Model_4 Model_5 Model_6`|
|---|
|`Age of respondent -0.010 -0.007 -0.005 -0.007 -0.004 -0.004`<br>`(0.007) (0.007) (0.009) (0.009) (0.007) (0.007)`<br>`Sex of respondent -0.155 -0.104 -0.331 -0.380 -0.167 -0.184`<br>`(0.367) (0.367) (0.392) (0.387) (0.344) (0.348)`<br>`Marital status is married 0.604* 0.612* 0.685* 0.634* 0.291 0.308`<br>`(0.331) (0.334) (0.373) (0.344) (0.316) (0.321)`|
|`Education is illiterate 0.131 0.133 -0.081 -0.107 -0.090 -0.090`<br>`(0.212) (0.213) (0.213) (0.207) (0.190) (0.192)`|
|`Family size 0.288*** 0.271*** 0.191** 0.200** 0.157** 0.158**`<br>`(0.088) (0.088) (0.086) (0.086) (0.075) (0.076)`<br>`Religion is Christian -0.691*** -0.670*** -0.825*** -0.822*** 0.001 0.002`|
|`(0.256) (0.256) (0.300) (0.300) (0.347) (0.343)`|
|`Livestock in TLU -0.047* -0.050* -0.063*** -0.075*** -0.083*** -0.085***`<br>`(0.026) (0.025) (0.022) (0.024) (0.026) (0.026)`<br>`Children under 15 -0.099 -0.070 -0.037 -0.041 -0.006 -0.004`<br>`(0.085) (0.083) (0.080) (0.077) (0.072) (0.073)`<br>`Distance to road -0.002*** -0.002*** -0.002*** -0.002*** -0.002* -0.002*`<br>`(0.001) (0.001) (0.001) (0.001) (0.001) (0.001)`<br>`Round2 0.272** 0.268** 0.271** 0.284** 0.319*** 0.483***`|
|`(0.114) (0.116) (0.118) (0.119) (0.118) (0.167)`<br>`Round3 0.861*** 0.867*** 0.894*** 0.891*** 0.904*** 0.782***`|
|`(0.160) (0.160) (0.164) (0.163) (0.169) (0.293)`<br>`Round4 0.552*** 0.563*** 0.593*** 0.592*** 0.613*** 0.604**`|
|`(0.147) (0.148) (0.150) (0.148) (0.149) (0.241)`<br>`Participation in CCT 0.350* 0.304 0.302 0.328** 0.331**`|
|`(0.206) (0.196) (0.190) (0.164) (0.164)`|
|`Risk Coefficient 0.052 0.113 0.129 0.152** 0.149**`<br>`(0.083) (0.080) (0.080) (0.073) (0.073)`|
|`Average temperature in`<sup>`0`</sup>`C 0.125*** 0.108*** 0.145* 0.145*`<br>`(0.037) (0.034) (0.080) (0.084)`|
|`Number of Injera baked 0.037*** 0.039*** 0.028* 0.027*`|
|`(0.010) (0.010) (0.015) (0.015)`|
|`Stove use for other purpose 0.418 0.471* 0.476 0.479`|

**24 |** P a g e