condition mean min max ZT0-3 5.730365000000001 5.546665000000001 5.914065 ZT4-7 4.161804999999999 4.161804999999999 4.161804999999999 ZT8-11 7.156665 7.156665 7.156665 ZT12-15 0 0 0 ZT16-19 9.00199 9.00199 9.00199 ZT20-23 5.50786 5.50786 5.50786