condition mean min max ZT0-3 489.099572 489.099572 489.099572 ZT4-7 579.391523 579.391523 579.391523 ZT8-11 521.7036175 521.7036175 521.7036175 ZT12-15 578.293832 578.293832 578.293832 ZT16-19 522.709067 522.709067 522.709067 ZT20-23 374.3878385 374.3878385 374.3878385