condition mean min max ZT0-3 25.805463105 19.66758039 31.94334582 ZT4-7 4.49193699275 3.0723673514999996 5.911506634 ZT8-11 12.46563594875 9.391248967500001 15.54002293 ZT12-15 12.35076514875 12.329155595 12.3723747025 ZT16-19 11.002522561 9.654065312 12.350979809999998 ZT20-23 15.8728055225 13.979560355 17.76605069