condition mean min max ZT0-3 23.694399 23.694399 23.694399 ZT4-7 40.6268215 40.6268215 40.6268215 ZT8-11 51.278005500000006 51.278005500000006 51.278005500000006 ZT12-15 49.221813 49.221813 49.221813 ZT16-19 59.8621995 59.8621995 59.8621995 ZT20-23 39.6861315 39.6861315 39.6861315