condition mean min max ZT0-3 15.859099999999998 15.04305 16.67515 ZT4-7 10.320875000000001 10.320875000000001 10.320875000000001 ZT8-11 8.703479999999999 8.703479999999999 8.703479999999999 ZT12-15 0 0 0 ZT16-19 13.53515 13.53515 13.53515 ZT20-23 13.29565 13.29565 13.29565