condition mean min max ZT0-3 8.805634999999999 8.41766 9.19361 ZT4-7 13.7369 13.7369 13.7369 ZT8-11 12.03625 12.03625 12.03625 ZT12-15 0 0 0 ZT16-19 12.366150000000001 12.366150000000001 12.366150000000001 ZT20-23 9.67419 9.67419 9.67419