condition mean min max ZT0-3 57.142654 57.142654 57.142654 ZT4-7 79.280501 79.280501 79.280501 ZT8-11 100.0824625 100.0824625 100.0824625 ZT12-15 97.441509 97.441509 97.441509 ZT16-19 247.5138995 247.5138995 247.5138995 ZT20-23 288.6163525 288.6163525 288.6163525