condition mean min max ZT0-3 15.733992 15.733992 15.733992 ZT4-7 12.048072000000001 12.048072000000001 12.048072000000001 ZT8-11 11.655722 11.655722 11.655722 ZT12-15 11.784239 11.784239 11.784239 ZT16-19 12.11496 12.11496 12.11496 ZT20-23 12.391745 12.391745 12.391745