condition mean min max ZT0-3 2184.3 2184.3 2184.3 ZT4-7 2459.7 2459.7 2459.7 ZT8-11 2590.3500000000004 2590.3500000000004 2590.3500000000004 ZT12-15 2540.6499999999996 2540.6499999999996 2540.6499999999996 ZT16-19 2760.75 2760.75 2760.75 ZT20-23 2468.95 2468.95 2468.95