condition mean min max ZT0-3 6.3914112652499995 4.3557971775 8.427025353 ZT4-7 5.7514897175 4.5927203995 6.910259035500001 ZT8-11 12.04379605125 9.881953727500001 14.205638375 ZT12-15 13.4256142625 13.26362229 13.587606234999999 ZT16-19 9.736591447999999 8.767745216 10.70543768 ZT20-23 11.6186905925 11.140261445 12.09711974