condition mean min max ZT0-3 50.829025 49.73445 51.9236 ZT4-7 31.3586 31.3586 31.3586 ZT8-11 63.11215 63.11215 63.11215 ZT12-15 0 0 0 ZT16-19 78.58715000000001 78.58715000000001 78.58715000000001 ZT20-23 72.17439999999999 72.17439999999999 72.17439999999999