condition mean min max ZT0-3 5.3041 5.3041 5.3041 ZT4-7 4.693555 4.693555 4.693555 ZT8-11 5.245025 5.245025 5.245025 ZT12-15 7.06543 7.06543 7.06543 ZT16-19 7.62998 7.62998 7.62998 ZT20-23 5.99114 5.99114 5.99114