condition mean min max ZT0-3 3533.3 3533.3 3533.3 ZT4-7 2769.6 2769.6 2769.6 ZT8-11 3194.0 3194.0 3194.0 ZT12-15 3461.1499999999996 3461.1499999999996 3461.1499999999996 ZT16-19 3268.3500000000004 3268.3500000000004 3268.3500000000004 ZT20-23 3394.1 3394.1 3394.1