Figure 2. Time (min) to 50%(open symbols) and 100%(closed symbols) twitch depression for infants and children given rocuronium intramuscularly in the deltoid muscle. The x-axis is the dose for each individual patient, displayed in the order in which the study was performed. An increase in dose indicated that the previous patient had < 75% twitch depression within 5 min; a decrease indicated that the previous patient had > 90% twitch depression within 5 min.