condition mean min max ZT0-3 268.847441 268.847441 268.847441 ZT4-7 194.3475395 194.3475395 194.3475395 ZT8-11 146.4368555 146.4368555 146.4368555 ZT12-15 87.10085699999999 87.10085699999999 87.10085699999999 ZT16-19 89.0003025 89.0003025 89.0003025 ZT20-23 155.6609975 155.6609975 155.6609975