**Table 7.** Knowledge: Network Spillover and Reinforcing Interaction Effects

||**Knowledge of**<br>**symptoms and causes**<br>**of STIs subindex**|**Sexual violence**<br>**knowledge**<br>**subindex**|**Prevention of STI**<br>**knowledge**<br>**subindex**|**Pregnancy**<br>**prevention**<br>**knowledge subindex**|**Condom use**<br>**knowledge**<br>**subindex**|**General**<br>**knowledge index**|
|---|---|---|---|---|---|---|
||**(1)**|**(2)**|**(3)**|**(4)**|**(5)**|**(6)**|
|Treatment student|0.132*|0.083|0.377**|0.201**|0.135*|0.278***|
||(0.067)|(0.062)|(0.153)|(0.090)|(0.075)|(0.081)|
|Spillover student|0.082|−0.023|0.137|0.065|0.035|0.022|
||(0.055)|(0.058)|(0.147)|(0.082)|(0.062)|(0.082)|
|Treatment student * % of friends treated|0.136*|0.038|0.258*|0.248**|0.056|0.179*|
||(0.081)|(0.080)|(0.155)|(0.106)|(0.079)|(0.100)|
|Spillover student * % of friends treated|−0.280*|0.170|0.185|−0.154|−0.034|−0.050|
||(0.159)|(0.177)|(0.380)|(0.213)|(0.196)|(0.217)|
|Number of friends|0.034*|0.074***|0.151***|0.080***|0.036*|0.104***|
||(0.018)|(0.017)|(0.043)|(0.019)|(0.019)|(0.020)|
|Control for baseline value of dep. var.|Yes|Yes|Yes|Yes|Yes|Yes|
|_P_-value treatment * (% of friends)<br>=spillover * (% of friends)|0.0387|0.492|0.859|0.0788|0.669|0.334|
|Observations|3,853|3,845|3,828|3,866|3,853|3,888|

_Source_ : Authors’ analysis from student surveys.

_Note_ : Dependent variable is an index of related questions. All components of the indices are standardized to mean 0 and standard deviation 1, based on the sample frame at baseline. Standard errors clustered at the school level in parentheses. *** _p <_ 0.01, ** _p <_ 0.05, * _p <_ 0.1. _Knowledge of symptoms and causes of STI subindex_ : Respondent knows STI symptoms include (a) abnormal discharges from the penis/vagina; (b) lesions/sores in genitals; and (c) painful urination; respondent knows: (d) vomiting and headache are not STI symptoms; (e) HIV can be transmitted by having sexual intercourse without a condom; (f) HIV can be transmitted by a contaminated blood transfusion; (g) HIV transmission does not depend on hygiene; (h) HIV cannot be transmitted via food sharing; (i) clothes sharing; or (j) being in a pool with an HIV-positive person. Respondent knows that (k) HIV is not transmitted if a condom is used while having sexual intercourse with an HIV-positive individual. _Sexual violence knowledge subindex_ : Respondent identifies (a) nonconsensual touching of genitalia, buttocks, breasts, inner thigh as abusive sexual contact; (b) forcible sex by husband on his wife as a form of sexual abuse; (c) having sex with a person who is impaired due to alcohol as a form of rape; (d) if an individual changes his/her mind about sex even at the last minute, sex is nonconsensual and hence a form of sexual abuse; (e) the use of threats to obtain sex is a form of sexual abuse; respondent knows: (f) sexual abuse is more often than not perpetrated by a known person not a stranger. _Prevention of STI knowledge subinde_ x: Respondent knows one of the safest methods to prevent an STI is the use of condom whereas the calendar-based methods, hormone injections, and penis withdrawal are not. _Pregnancy prevention knowledge subindex_ : Respondent disagrees with (a) penis withdrawal is a safe method to avoid pregnancy; respondent knows: (b) women can become pregnant in their first sexual relationship; (c) safe methods to prevent a pregnancy include injections and condom; (d) unsafe methods to prevent a pregnancy include calendar-based methods and penis withdrawal; respondent knows that (e) emergency postcoital contraception pills have secondary effects. _Condom use knowledge subindex_ : Respondent knows (a) one of the safest methods to prevent an STI is the use of a condom; (b) condoms can be used only one time; (c) HIV can be transmitted by having sex without a condom; (d) HIV is not transmitted if a condom is used even if the person is HIV positive; (e) one of the safest methods to prevent a pregnancy is by using a condom. _General knowledge index_ : an index of all the variables used in the subindices of the table.