Overall , there were no statistically significant differences in operative time ( p = 0.088 ) , stone fragmentation time ( p = 0.074 ) , postoperative VAS pain score at 6 and 24 hours ( p = 0.156 , 0.146 ) , incidence of complications ( p = 0.870 ) , stone-free rate ( p = 0.804 ) , and hospital stays ( p = 0.907 ) between the two groups .