condition mean min max ZT0-3 2973.0 2973.0 2973.0 ZT4-7 3366.7 3366.7 3366.7 ZT8-11 3102.6000000000004 3102.6000000000004 3102.6000000000004 ZT12-15 2563.0 2563.0 2563.0 ZT16-19 3007.6 3007.6 3007.6 ZT20-23 3584.6499999999996 3584.6499999999996 3584.6499999999996