Table 2: Energy values delivered by the 4 types of LCUs as received, cleaned and with/without barrier.

Factor	n	Mean ± SD Energy (J/cm2)	Range (J/cm2)
Group 1 (As received)	58	16.99 ± 4.60	3.98 - 28.77
Group 2 (As received with barrier)	58	15.78 ±4.28	3.77 - 26.29
Group 3 (Cleaned)	58	18.53 ± 4.98	4.15 - 33.65
Group 4 (Cleaned with barrier)	58	17.18 ± 4.66	4.03 - 31.68