condition mean min max ZT0-3 27.528298330000002 22.465662270000003 32.59093439 ZT4-7 10.680535336750001 9.8199802685 11.541090405 ZT8-11 9.966091011 9.483094972 10.44908705 ZT12-15 12.21478758875 10.5158122675 13.913762909999999 ZT16-19 16.9025441625 14.774401695 19.030686629999998 ZT20-23 27.2670247 24.79224781 29.74180159