156q: true about cross sectional study are all except ?
a. less expensive
b. less time required
c. many outcomes are possible
d. relationship between cause and effect possible
157q: chandler’s index is meant for ?
a. filariasis
b. ankylostoma
c. guinea worm
d. round worm
158q: extra calories required during lactation ?
159q: all are true regarding case fatality rate except ?
a. killing power of disease
b. more useful in chronic diseases
c. value changes with different epidemic
d. time interval is not considered
160q: time interval between primary and secondary case is ?
a. serial interval
b. extrinsic incubation period
c. period of communicability
d. intrinsic incubation period
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