condition mean min max ZT0-3 1.7413075 1.583175 1.8994399999999998 ZT4-7 1.602365 1.602365 1.602365 ZT8-11 1.4797985 1.4797985 1.4797985 ZT12-15 0 0 0 ZT16-19 1.42974 1.42974 1.42974 ZT20-23 2.0978499999999998 2.0978499999999998 2.0978499999999998