condition mean min max ZT0-3 9.457135000000001 7.832815 11.081455 ZT4-7 5.58731 5.58731 5.58731 ZT8-11 3.1459200000000003 3.1459200000000003 3.1459200000000003 ZT12-15 0 0 0 ZT16-19 5.121145 5.121145 5.121145 ZT20-23 18.4292 18.4292 18.4292