condition mean min max ZT0-3 59.4345 59.4345 59.4345 ZT4-7 47.6635 47.6635 47.6635 ZT8-11 30.57975 30.57975 30.57975 ZT12-15 30.66465 30.66465 30.66465 ZT16-19 38.113749999999996 38.113749999999996 38.113749999999996 ZT20-23 51.675 51.675 51.675