condition mean min max ZT0-3 83.086494 83.086494 83.086494 ZT4-7 199.95759750000002 199.95759750000002 199.95759750000002 ZT8-11 224.7571955 224.7571955 224.7571955 ZT12-15 194.7199685 194.7199685 194.7199685 ZT16-19 173.2940255 173.2940255 173.2940255 ZT20-23 140.687485 140.687485 140.687485