condition mean min max ZT0-3 22.24305 22.24305 22.24305 ZT4-7 19.327350000000003 19.327350000000003 19.327350000000003 ZT8-11 15.756350000000001 15.756350000000001 15.756350000000001 ZT12-15 18.9435 18.9435 18.9435 ZT16-19 23.0709 23.0709 23.0709 ZT20-23 19.494349999999997 19.494349999999997 19.494349999999997