condition mean min max ZT0-3 4.55792 4.55792 4.55792 ZT4-7 3.3297600000000003 3.3297600000000003 3.3297600000000003 ZT8-11 3.810705 3.810705 3.810705 ZT12-15 4.455019999999999 4.455019999999999 4.455019999999999 ZT16-19 6.082095000000001 6.082095000000001 6.082095000000001 ZT20-23 5.009395 5.009395 5.009395