condition mean min max ZT0-3 166.613304 166.613304 166.613304 ZT4-7 403.80897949999996 403.80897949999996 403.80897949999996 ZT8-11 440.390756 440.390756 440.390756 ZT12-15 372.2570605 372.2570605 372.2570605 ZT16-19 207.3914985 207.3914985 207.3914985 ZT20-23 181.49497200000002 181.49497200000002 181.49497200000002