condition mean min max ZT0-3 156.438654 156.438654 156.438654 ZT4-7 260.71700450000003 260.71700450000003 260.71700450000003 ZT8-11 268.84315300000003 268.84315300000003 268.84315300000003 ZT12-15 332.57014000000004 332.57014000000004 332.57014000000004 ZT16-19 242.3667685 242.3667685 242.3667685 ZT20-23 138.2654705 138.2654705 138.2654705