Group	Number of cases	Sputum character [example (%), %]
Group	Number of cases	I degree	II degree	III degree
Post application of evidence	52	4 (7.69)	28 (53.85)	20 (38.46)
Post application of evidence	46	33 (71.74)	13 (28.26)	0
z-value		−6.860 0.000
p-value		−6.860 0.000